A handmade two piece bikini set is a rewarding project for sewists who want swimwear that fits comfortably and reflects their personal style. With the right stretch fabric and sewing techniques, you can create swimwear that's both flattering and durable for beach days, poolside lounging, or vacations.
The Winslet's Masha Two-Piece Bikini Set Pattern is designed to help you sew a stylish lined balconette bikini top with adjustable shoulder straps and Brazilian bikini bottoms featuring a lined gusset and a high-cut back. Suitable for easy-level sewists, this pattern provides detailed guidance from cutting your fabric to assembling the finished swimwear.
Why Sew a Two Piece Bikini Set?
- Create a coordinated swimwear set tailored to your preferred fit.
- Enjoy the comfort of a lined balconette bikini top with adjustable shoulder straps.
- Sew Brazilian-style bikini bottoms with a lined gusset and a flattering high-cut back.
- Customize your swimwear by choosing fabrics, prints, and colors that match your style.
- Build confidence sewing stretch swim fabrics while learning useful swimwear construction techniques.
- Make a durable swimsuit that's perfect for beach holidays, pool days, and tropical vacations.
Why Choose the Winslet's Masha Two Piece Bikini Set Pattern?
The Winslet's Masha Two-Piece Bikini Set Pattern combines modern swimwear styling with beginner-friendly construction, making it an enjoyable project for anyone looking to sew their own swimsuit.
Skill Level: Easy
Key Features:
- Lined balconette bikini top
- Adjustable shoulder straps
- Brazilian bikini bottoms
- Lined gusset
- High-cut back silhouette
- Designed specifically for stretch swim fabrics
Available Sizes: US 02 - US 32 | UK 06 - UK 36 | EU 36 - EU 64
Supplies & Notions
Prepare the following supplies before you begin sewing:
- Poly nylon lycra knit fabric
- 3-ply polyester thread
- 5 mm wide elastic
- Adjustable slide buckles
- Strap loop rings
- Sewing machine
- Serger/overlocker (or zig-zag stitch alternative)
- Coverstitch machine (or twin needle/zig-zag alternative)
- Binder attachment
- Sewing needles suitable for stretch fabrics
- Pins
- Tape measure
- Fabric shears
- Thread cutter
- Tailor's chalk
- Iron
If you do not have a serger, use a zig-zag stitch with a reduced presser foot pressure and, if available, a walking foot. If you do not have a coverstitch machine, use a twin needle or a narrow zig-zag stitch for a similar finish. Always test your stitches on a fabric scrap before sewing the garment.
Fabric Recommendations
This pattern is designed for lightweight 4-way stretch knit fabrics with 50–100% stretch, including:
- Nylon spandex scuba
- Polyester spandex jersey
- Tricot knit
- Ribbed swimwear knit
The sample garment is sewn using poly nylon lycra knit fabric, chosen for its:
- Smooth, stretchy feel
- Excellent recovery
- Flexibility
- Moisture-wicking performance
- Breathability
- Compatibility with stretch sewing needles
These fabrics provide the comfort, movement, and durability expected from handmade swimwear.
Size Charts
Check the size charts and measure yourself to select the correct size, using the garment and body measurement tables in the guide.
Verify how much fabric you need by referencing the fabric yield table in the guide.
Pattern Inventory: What Pieces to Prepare
Cut the following pattern pieces:
- A. Front Top — Cut 1 fabric
- B. Front Lining Top — Cut 1 fabric
- C. Back — Cut 2 fabric
- D. Strap — Cut 2 fabric
- E. Top Binding — Cut 2 fabric
- F. Front Bottom — Cut 1 fabric
- G. Back Bottom — Cut 1 fabric
- H. Gusset — Cut 1 fabric
If printing at home, use the A4/US Letter pattern. For copy-shop printing, use the A0 pattern.
Pattern Marking
Transfer all pattern markings before sewing, including:
- Grainlines
- Waist markings
- Underbust markings
- Side seams
- Neckline
- Back across
- Leg openings
- Crotch markings
- Gusset top edge
- Pad opening
- Seam allowance guides
Accurate markings help ensure proper alignment and garment construction throughout the sewing process.
Cutting Layout
Arrange your pattern pieces according to the recommended layouts for either 45-inch or 60-inch wide fabric.
Ensure that each grainline runs parallel to the fabric selvage before pinning and cutting. The layouts shown are intended for non-directional fabrics. If your fabric has a nap or directional print, purchase extra yardage to accommodate the layout. The illustrated layouts use a US size 12 as an example.
Fabric Cutting and Preparation
Arrange the pattern pieces according to the cutting layout diagrams, making sure the grainline arrows remain parallel to the selvage.
Trace and cut each piece carefully, trimming precisely along the cutting lines and clipping all required notches. Transfer pattern markings such as circles, fold lines, and other construction references to the wrong side of the fabric. Mark the center front on any pieces cut on the fold to simplify assembly later.
Seam Allowance
Please follow the seam allowances as indicated on the pattern file layers. These are provided specifically for each piece to ensure accurate construction.
This pattern uses a 1 cm (3/8 inch) seam allowance all around except armholes, neckline and leg openings.
Step-by-Step Sewing Instructions
Pro Tip: Pinning the pieces before sewing is always helpful. It is recommended to press the pattern pieces after every step for a better sewing experience. If you use a different fabric for the lining in practice, remember that the guide illustrates it in a contrasting color only to make construction easier to understand.
1. Prepare the Front Lining
Serge both pad openings on the Front Lining Top to create a clean finish before assembling the bikini top.
2. Prepare the Bikini Top with the Lining
2a. Place the Front Lining Top and Back lining pieces with their right sides together.
2b. Align the side seams and overlock both side seams.
2c. Repeat the same process for the main Front Top and Back pieces.
3. Attach the Lining
3a. Turn the completed main bikini top right side out.
Insert the prepared lining (wrong side out) inside the main top.
3b. Match the Back Lining with the Back Top and the Front Lining with the Front Top, keeping the wrong sides facing each other.
Pin the layers together carefully.
4. Prepare the Adjustable Shoulder Straps
4a. Fold the back piece in half, then fold it again into four equal sections to create three crease lines. Mark the outer two crease lines on the back across as the strap placement points.
Repeat the same folding method along the front neckline to mark the front strap placement points.
4b. Cut the straps to the lengths specified in the sewing guide.
4c. Thread one long strap through an adjustable slide buckle, fold the end back, and secure it with lock stitches and backstitches.
4d. Pass the free end of the strap through one loop ring.
4e. Bring the strap back through the adjustable slide buckle to complete the adjustable strap.
4f. Repeat the same process to prepare the second adjustable strap.
4g. Take a 4.5-inch strap, pass approximately 1 inch through the loop ring, then secure it with lock stitches and backstitches.
Repeat this step for the second short strap to complete the strap assembly.
5. Finish the Neckline, Back, and Underbust with Binding
5a. Prepare the binder attachment as illustrated in the sewing guide.
5b. Position the binding and garment correctly before sewing.
5c. Insert the Top Binding into the binder attachment and stitch approximately 3/8 inch to secure the fold.
Beginning at one side seam, feed the neckline seam allowance into the binder and continue stitching around the front neckline, back across, and back to the starting point.
Leave approximately 1 inch of unstitched binding before trimming the excess.
5d. Fold the final ½ inch of binding toward the wrong side.
Overlap the starting edge of the binding and secure it with a lock stitch along the existing stitching line.
Finish by sewing perpendicular to the binding edge to secure the overlap.
Repeat the same process to bind the underbust edge using the second binding strip.
Alternative: If you prefer not to use binding, fold the seam allowance toward the wrong side and finish it with a coverstitch or narrow zigzag stitch. Repeat this method for the neckline, back edge, and underbust.
6. Attach the Shoulder Straps
Place one completed strap on the marked strap point on the lining side.
Position the shorter strap end toward the back and the longer adjustable end toward the neckline.
Align the lower edge of the binding with the strap end and secure it using several backstitches.
Repeat the same process for the remaining strap at the opposite strap points on the neckline and back.
7. Prepare the Bikini Bottoms
7a. Serge the top edge of the Gusset.
7b. Place the right side of the Gusset against the wrong side of the Back Bottom.
Position the Front Bottom over the Back Bottom with right sides together.
Align the crotch seam and overlock through all layers.
7c. Spread the Front Bottom and Back Bottom open with the wrong side facing upward.
7d. Fold the Gusset over the Front Bottom, align the leg opening edges, and baste the gusset seam allowance to the Front Bottom to hold everything in place before finishing the remaining construction.
8. Finish the Leg Openings and Waist
Using the same binding technique described for the bikini top, finish the leg openings and waist edge of the bikini bottoms.
If using a binder attachment:
- Insert the binding into the binder.
- Feed the seam allowance through evenly.
- Overlap the binding ends neatly and secure them with a lock stitch followed by a perpendicular stitch.
If you prefer not to use binding, fold the seam allowance toward the wrong side and secure it with a coverstitch or narrow zigzag stitch for a clean stretch finish.
Ready to Sew Your Own Two Piece Bikini Set?
The Winslet's Masha Two-Piece Bikini Set Pattern is a fun and rewarding project for sewists who want to create stylish handmade swimwear. Featuring a lined balconette bikini top with adjustable shoulder straps and Brazilian bikini bottoms with a lined gusset and high-cut back, this pattern combines comfort, support, and modern swimwear styling.
Designed for an easy skill level, the Masha pattern introduces essential swimwear techniques such as working with stretch fabrics, creating adjustable straps, attaching binding, and constructing lined bikini pieces. Whether you choose bold prints or classic solids, you'll finish with a custom bikini set that's perfect for holidays, beach days, and poolside relaxation.
Ready to start your next sewing project? Download the Masha Two-Piece Bikini Set Pattern and create a handmade swimsuit you'll love wearing all summer long.
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Join the Community & Get Support
Share your finished Masha Two-Piece Bikini Set Pattern on social media with #MadeWithWinslets. If you have questions, feedback, or customization requests, contact the Winslet's team at support@winslets.com.
