If you want to sew a true wardrobe icon—a structured, fully-lined blazer with tailored details and beautiful fit—look no further than this advanced-level project. The Monroe Blazer Sewing Pattern by Winslet’s blends timeless style (welt pockets, chest pocket, classic lapels, button cuffs, and vent) with detailed construction, making it the ideal challenge for ambitious sewists.
This post walks you through every step, from prep and layout to final pressing. Each section is distilled in a detailed way with no shortcuts or missed details—so you can craft an heirloom-quality garment with full confidence.
Get the patternWhy Sew a Classic Blazer?
- Timeless tailoring: A well-fitted blazer elevates any wardrobe year-round.
- Skills upgrade: Master darts, vents, welt pockets, lining, structured collar, and buttonholes.
- Choice of fabrics: Sew in velour, tweed, corduroy, or wool blends for personalized flair.
- Polished finish: Full lining, chest pad (optional), sleeve head roll, and meticulous seamwork provide a couture touch.
- Versatility: Dress up jeans or wear over slacks, skirts, or dresses for any occasion.
Why Choose the Winslet’s Monroe Blazer Pattern?
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Advanced and rewarding: Designed with all classic elements for experienced sewists.
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Sharp silhouette: Boxy structure with functional button cuff and vent.
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Includes all extras: Welt pockets, chest pocket, optional pads, and shaped lining.
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Pro guidance: Clear diagrams, marking instructions, and piece labels throughout.
The Monroe Blazer pattern is available for sizes US 02 - US 18 | UK 06 - UK 22 | EU 36 - EU 50. Check the Monroe Blazer Size Guideand measure yourself to select the correct size (see the garment and body measurement tables).
Verify how much fabric you need by referencing the fabric yield table.
Step 1: Supplies & Notions
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Main fabric: Medium to heavy non-stretch fabric (cotton velour, wool blend, tweed, corduroy, brushed fleece, French terry)
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Lining fabric: Light, stable fabric for a smooth interior finish
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Matching 3-ply polyester thread
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Fusible interfacing (for structure—critical at collar, lapels, facings, pockets)
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Buttons for front and cuffs (see pattern for quantity)
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Button presser
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Sleeve head roll, shoulder/chest pad, sleeve pad (optional for shaping)
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Fabric shears/rotary cutter, thread cutter
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Iron
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Tape measure
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Chalk/marker/pencil
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Pins, hand-sewing needles, sewing machine
- Serger/overlock or zig-zag capability for finishing
Pro tip: Always test stitch on scraps, especially if using thick or textured fabric.
Step 2: Printing Your Digital Sewing Pattern
Before cutting your fabric, print your digital pattern at 100% scale on the correct paper size (usually A0 or A4/US Letter). Once printed, trim and tape the pages together following the pattern guide. Now your pattern is ready to use!
If you want to learn more about how to Print Digital Sewing Patterns, click here.
Step 3: Pattern Inventory: What Pieces to Prepare
For sewing the Monroe Blazer, cut all of these pieces:
Main Fabric
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Front (cut 2)
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Left back (cut 1)
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Right back (cut 1)
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Side back (cut 2)
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Front sleeve (cut 2)
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Back sleeve (cut 2)
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Front facing lining (cut 2)
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Collar (cut 2)
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Pocket bone (cut 2)
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Front pocket flap (cut 2)
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Chest pocket bone (cut 1)
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Chest pocket lining (cut 1)
Lining Fabric
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Front lining (cut 2)
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Left back lining (cut 1)
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Right back lining (cut 1)
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Side back lining (cut 2)
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Front sleeve lining (cut 2)
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Back sleeve lining (cut 2)
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Pocket lining (cut 4)
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Chest pocket lining (cut 1)
Step 4: Pattern Marking
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Lay out all pattern pieces according to the cutting diagrams. Ensure the grainline arrow for each piece runs parallel to the selvage for best drape.
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Transfer all markings: Notches, grainlines, center fronts/backs, fold lines, circles, buttonholes, and strap/zipper placements, using chalk, pen, or tailor’s tacks onto the wrong side of your fabric.
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Cut notches anywhere they appear on the pattern edge—these are crucial for proper alignment and assembly.
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Mark the center front on all pieces cut on the fold.
Step 5: Cutting Layout
- Reference the correct layout diagram in the Monroe Sewing Guide for your chosen size and fabric width (45” or 60”).
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If using fabric with nap or a directional print, buy extra yardage and align pattern pieces accordingly.
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Pin or use pattern weights to secure each piece for accurate cutting.
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Trace the shapes and cut along the outlines, carefully removing any marking lines after cutting.
Step 6: Fabric Cutting and Preparation
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Cut out every required piece per your size from your main fabric. For pieces needing two cuts, fold fabric as shown in cutting diagram.
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Cut all notches as shown on the pattern.
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Double-check that you have all pieces before you start sewing.
Seam allowance: Follow the seam allowances as indicated on the pattern file layers. These are provided specifically for each piece to ensure accurate construction. This pattern includes a 1 cm (0.4 inch) seam allowance all around, except for: 1.3 cm (1/2 inch) at the side seam of the front pattern, all around the front sleeve lining, and the center back of the left back lining; 1.2 cm (1/2 inch) at the top and bottom of the chest pocket bone and 3 cm (1.2 inches) at its sides; and 3.8 cm (1 1/2 inches) at the front hem of the main fabric.
Step 7: Step by Step Instructions to Sew a Blazer
1. To create double welt chest blazer pocket:
1a. Fold on the shorter sides of chest pocket bone piece to the wrong side and iron it.
1b. Place the chest pocket lining on the prepared front with their wrong sides facing each other. Align top edge with pocket top and pin it in place.
1c. Place the longer open edge of the prepared chest pocket bone onto the right side of the prepared front.
1d. Sew along the bottom pocket marking.
1e. Place the chest pocket lining (main fabric piece) on the top pocket line of the front
facing right sides to each other.
1f. Trim both sides of the pocket bone from edge to the stitch line of the seamline.
1g. Fold the pocket lining seam allowance and pocket bone away to trim the pocket marking at the center, cutting diagonally at the corners to create V-shaped cuts. Refer image 1g.
1h. Figure represent the after trimmed look.
1i. Pass the pocket bone and pocket lining through the trimmed pocket marking to the
wrong side.
1j. Fold both chest pocket bone side inwards to hide the raw edge on the right side of the
front. Sew along the edges from inside of the pocket bone such that no stich line appear on the top of the chest pocket bone.
1k. Wrong side view of the front piece.
1l. Align the chest pocket lining with the other chest pocket lining and sew all around
the edges of the pocket lining.
Optional: Serge around the edges of the pocket lining pieces to finish them neatly.
2. To finish the dart:
2a. Slit the top pocket line of the front piece.
2b. Join the two dart legs together and iron it. Sew along the joined seam to close the dart.
2c. Press it flat down. Apply fusible interfacing over the joined dart legs and pocket marking, using a piece large enough to cover the entire area.
3. To attach side seams:
3a. Place the front piece and side back piece together with their right sides facing each other.
3b. Match the side seam notches. Pin and sew along the side seam.
3c. Spread open the seam and iron at both sides. Repeat the same process for the other front and side back pieces.
4. To prepare pocket flap and pocket bone:
4a. Fold the pocket flap in half on the longer side with the right sides facing inside. Iron it.
4b. Sew along both shorter sides, leaving the longer side unstitched.
4c. Turn the pocket flap right side out.
4d. Fold the pocket bone in half on the shorter side. Repeat the step 4a -4d for the other pocket flap and pocket bone.
4e. Place the pocket bone on top of the pocket flap, aligning its folded edge with the seamline of the pocket flap. Sew along the seamline to attach them together. The smaller side of the pocket bone from the stitch line is the upper welt of the pocket. Repeat the same process for the other pocket flap.
5. To create waist pocket with flap:
5a. Place the pocket lining on the wrong side of the front piece, aligning it with the pocket
marking. Pin it in place.
5b. Place the prepared pocket flap on the right side of the front piece. Align the stitch line of the pocket flap with the top pocket marking. Sew along the top pocket marking to secure it in place. Refer to Fig. 5b.
5c. Place the long open edge of the pocket bone along the bottom pocket marking on the front piece (right side) and sew along the bottom line.
5d. Fold the seam allowances of both the pocket bone and the pocket flap away from the pocket marking. Trim along the pocket marking at the center, making diagonal (V-shaped) cuts at the corners.
5e. Turn the pocket bone and the seam allowance of the pocket flap to the wrong side
through the trimmed pocket marking.
5f. Fold the front opening side of the front piece towards side seam to reveal the trimmed
corners, pocket flap, and pocket bone. Sew along the edges on both sides of the pocket to secure them. Repeat the same to the other side.
5g. Iron the pocket bone pieces and pocket lining. Sew close to the edge of both pocket
bone, following the bottom pocket line to secure it. Refer to Fig. 5g.
5h. Sew along the edges of the pocket bottom and pocket sides on the right side of the
fabric, ensuring the pocket lining and pocket bone are positioned underneath.
5i. Place the second pocket lining piece on the first one, with their right sides facing
each other.
5j. Attach the two pocket lining pieces by stitching along the seamlines on all edges.
5k. Serge with a zig-zag stitch or overlock stitch around the entire pocket edge to finish
it neatly.
6. Preparing the vent:
6a. Fold the hemline and vent of the left back piece to the wrong side and iron to crease.
6b. Fold the hemline and outer vent of the right back piece to the wrong side andiron to crease.
7. To attach back pieces to prepared front piece:
7a. Place the prepared left front piece (front and side back attached) and the left back piece together, with their right sides facing each other.
7b. Match the bust line, waist line and back across line together. Sew along the back panel seam.
7c. Spread open and iron the seam.
7d. Repeat the same process for the prepared right front piece and the right back piece.
8. To attach the center back:
8a. Place the left back and right back pieces together with their right sides facing each other.
8b. Align the center back and sew from the top neckline to the vent starting point.
8c. Spread open the seamline and iron it.
9. To attach shoulder seams:
Place the shoulder seams of the coat together with their right sides facing each other. Sew along the shoulder seams on both sides.
10. To prepare front lining panel:
10a. Place the front-facing and the front-side lining pieces together with their right sides facing each other.
10b. Align the front panel seams and sew along the seamline.
10c. Spread open and iron the seam.
11. Attach all lining pieces together:
11a. Place the left back lining and side back lining pieces together with their right sides facing each other. Align the back panel seam.
11b. Sew along the back panel seam.
11c. Spread open the seam and iron it.
11d. Repeat steps 11a to 11c for the right back lining and side back lining pieces.
11e. Place the prepared left side and right side lining pieces together with their right sides
facing each other.
11f. Sew along the center back panel seam till the vent starting point.
11g. Spread open the seam allowance of the center back seam and iron it. Place both
prepared front lining pieces onto the back lining with their right sides facing. Align the side seams and sew along them.
11h. Align the shoulder seams of the lining pieces with their right sides facing each other. Sew along the shoulder seams.
12. To attach front facing lining and prepared main fabric front piece:
12a. Place the front piece and the front facing lining piece together with their right sides facing each other.
12b. Align the front opening seam and sew from the collar end notch to the hemline break seam.
12c. Repeat steps 12a and 12b process on both sides of the prepared coat. Trim any excess fabric from the bottom hem of the front.
13. To finish back vent:
13a. Place the back vent pieces of the main fabric together with their right sides facing each other. Sew along the top chalk marked seamline of the vent.
13b. Fold the hemline and align the hem corners.
13c. Sew the hemline corner from the wrong side till chalk marked seamline. Repeat steps 13b to 13c for the left side of the vent.
13d. Place the lining vent over the vent of the main fabric, with their right sides facing each other. Sew along the vent, stopping at the hemline of the main fabric.
13e. Sew along the vent top of the main fabric to secure them. Ensure to sew until the chalk marked seamline of the left vent.
13f. Align the left-side vent and vent top of the lining with the corresponding areas on the main fabric, with their right sides facing each other. Sew along the vent top and the left-side vent, stopping at the hemline of the main fabric.
13g. Fold the hemline of the lining all around the coat and press it with an iron. At the corners, tuck the raw edges inside the lining. Align the hemline of the lining with the hemline of the main fabric, with their right sides facing each other. Sew along the hemline all around the coat to complete the finishing.
14. To attach collar:
114a. Place both collar pieces together with their right sides facing each other. Sew along the seamline, leaving the collar stand unstitched.
14b. Turn the collar right side out.
14c. Fold the seam allowance of collar stand outward and iron it to create a crease.
14d. Pin the prepared collar to the lining neckline, aligning the ends with the collar end notches and neckline starting point.
14e. Sew both neckline starting point to collar end then neckline.
14f. Sew along the neckline from neckline starting point to the other point.
14g. Similarly, pin the other side of the prepared collar to the main fabric neckline, with their right sides facing each other. Sew along the neckline of the main fabric.
14h. Turn the coat right side out.
15. To prepare sleeve with lining:
15a. Place the front and back sleeve pieces together with their right sides facing each other. Align the sleeve panel seam and sew along the seamline up to the vent top seamline. Repeat the same process for the front and back lining pieces, sewing up to the
start of the vent top.
15b. Fold the hem and hem corners from the seamline. Place the hem corners to gather with their right sides facing each other. Sew along the hem corner until the seamline is chalk marked.
15c. Repeat steps 15a and 15b for the other side of the vent.
15d. Place the lining and main fabric of the sleeve together with their right sides facing each other. Align the hemlines and sew along the hemline of the back sleeve.
15e. Align the lining and main fabric at the vent. Sew along the seamline to secure them.
15f. Sew along the vent top of the main fabric, ensuring to sew until the front sleeve vent top chalk marked seamline.
15g. Place the front sleeve lining and front sleeve of the main fabric together with their right sides facing each other. Align the vent top, vent, and hemline, then sew them together.
15h. Align the side seams of the front and back main fabric with the side seams of the front and back lining fabric. Sew along the side seams of both in one continuous stitch.
15i. Adjust the main fabric and lining sleeve into their correct positions and iron to smooth out the seams.
16. To attach sleeve with lining to the prepared lined coat:
16a. Place the prepared sleeve with lining inside the armhole of the main fabric, aligning the armholes. Baste the armholes of the sleeve and coat of the main fabric together.
16b. Sew along the armholes of the main fabric to secure the sleeve.
16c. Pull out the lining sleeve. Place and pin the lining armhole to the coat lining armhole with their right sides facing each other.
16d. Sew along the armhole seamline as far as possible.
16e. Hand-stitch the remaining section of the lining armhole seam, ensuring the right sides are facing each other.
17. Create buttonholes and sew buttons:
Use a button presser to create buttonholes on the designated markings of the coat. Additionally, create buttonholes on the sleeve vents as you desire. Sew all buttons in positions corresponding to the buttonholes.
Winslet’s sewing guide for Monroe Blazer includes clear diagrams that walk you through each step, making it easy to follow and complete your project with confidence.
For an overview of Winslet’s Sewing Guides, click here.
Ready to Make Your Own Classic Blazer?
If you want a truly timeless, tailored result, try the Winslet’s Monroe Blazer Sewing Pattern. Every step is thoughtfully guided so you get wardrobe-worthy results, no matter your style or fabric choice.
Purchase your printable Monroe Blazer Sewing Pattern today and craft a blazer you’ll love for years.
Show Off Your Blazer
Show your creation on Instagram or Facebook with #MadeWithWinslets for a chance to be featured! For any questions or issues, email the Winslet’s support team at support@winslets.com.
