A swim dress with built-in shorts is one of the most versatile warm-weather projects you can sew. It combines the comfort and coverage of a one-piece with the ease of a sporty dress, making it a great choice for swimming, beach days, and active summer wear. This detailed guide follows the Winslet's Bruna Swim Dress sewing instructions closely so you can create a polished, practical garment with confidence.
If you want a pattern that balances style, support, and ease of construction, the Winslet's Bruna Swim Dress is an excellent choice. Its crisscross strappy back, attached shorts with pockets, and fit-and-flare shape make it both flattering and functional.
Why Sew a Swim Dress?
- More coverage: The attached shorts add comfort and confidence.
- Activewear-friendly: Great for swimming, beach outings, and resort wear.
- Flattering fit: The fit-and-flare shape gives ease without feeling bulky.
- Practical details: Pockets, stretch construction, and supportive straps.
- Custom style: Choose prints, solids, or color blocking for a look that feels personal.
Why Choose the Winslet's Bruna Pattern?
- Easy skill level: Clear steps and straightforward knit construction.
- Stylish design: Sleeveless bodice, crisscross back, shorts, and skirt layers.
- Stretch-friendly: Designed for lightweight 4-way stretch knit fabrics.
- Inclusive sizing: US 02 - US 32 | UK 06 - UK 36 | EU 36 - EU 64
- Professional finish: Built for clean seams and a ready-to-wear look.
Supplies & Notions
- Winslet's Bruna Swim Dress sewing pattern
- Lightweight 4-way stretch knit fabric with 50–100% stretch, such as nylon spandex scuba, polyester spandex jersey, tricot knit, or ribbed swimwear knit.
- 3-ply polyester thread.
- Chalk or fabric marker.
- Fabric shears or rotary cutter.
- Thread cutter.
- Pins and needles.
- Sewing machine.
- Stretch needle.
- Serger or overlock machine, or a zig-zag stitch as an alternative.
- Coverstitch machine or twin needle for hem finishing.
Always test your stitch settings on a fabric scrap before sewing the final garment.
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 pieces from your fabric:
- Center front bodice – cut 2.
- Side front bodice – cut 4.
- Skirt – cut 2.
- Front bottom – cut 2.
- Back bottom – cut 1.
- Side bottom – cut 2.
- Waist strap – cut 2.
- Back strap – cut 2.
- Pocket – cut 2.
If you are printing at home, use the A4/US Letter pattern. If you are using a copy shop, use the A0 version.
Pattern Marking
- Lay out all pattern pieces according to the cutting layout diagrams.
- Make sure each grainline arrow runs parallel to the selvage.
- Transfer markings such as circles, buttonholes, fold lines, strap placements, pocket guidelines, waist lines, hip lines, side seams, armholes, neckline marks, and notches to the wrong side of the fabric.
- Mark the center front on pieces cut on the fold so alignment stays accurate.
- Cut notches carefully where indicated.
Cutting Layout
- Use the correct cutting layout for your selected size and fabric width, whether 45 or 60 inches.
- The layout is non-directional, but directional prints or fabrics with nap will require extra fabric.
- Pin the pieces in place before cutting to avoid shifting.
- Cut carefully and keep all markings intact for construction.
Fabric Cutting and Preparation
- Cut all fabric pieces according to the pattern inventory.
- Transfer every marking before removing the pattern pieces.
- Double-check that you have all required pieces before sewing.
- Follow the seam allowances in the pattern file layers for each piece.
The guide uses a 1 cm seam allowance around most seams, 1.3 cm at the waist side seams, 2 cm at the skirt hem, and 2.5 cm at the shorts hem and pocket top edge.
Step-by-Step Sewing Instructions
1. Prepare the front bodice
- Place the center front bodice and side front bodice pieces right sides together.
- Align the panel notches carefully.
- Overlock the panel seamline.
- Open the center front bodice and side piece from the seamline and press with an iron.
- Repeat for the other side of the front bodice.
- Repeat the same steps for the lining front bodice.
2. Prepare the back strap
- Fold the back strap in half lengthwise, right sides together.
- Overlock the long edges.
- Turn the strap right side out and press flat.
3. Prepare the waist strap
- Fold the waist strap in half lengthwise, right sides together.
- Overlock the long edges.
- Turn the strap right side out and press flat.
4. Assemble the upper bodice
- Place the straps on the right side of the prepared front bodice panel at the shoulder seam, matching the strap notches.
- Pin the straps in place.
- Place the prepared front bodice lining over it, right sides together, sandwiching the straps.
- Overlock both shoulder seams.
- Flip one prepared front bodice from the shoulder seam.
- Cross the back straps and align each end to the opposite side seam just below the armhole, with the left strap going to the right seam and the right strap going to the left seam.
- Pin the back straps in place.
- Pin the waist strap just below the back strap at each side seam, keeping the crisscross design in place.
- Align the side seam side of the waist strap with the bodice side seam.
- Flip the front bodice again, sandwiching the straps between the right sides of the front bodice layers.
- Overlock around the neckline, armholes, and side seams to secure all layers together.
5. Finish the pocket top edge
- Fold the seam allowance of the pocket top edge toward the wrong side and press.
- Cover-stitch the folded top edge on the right side so the double stitch line shows neatly on the front.
- Repeat for the second pocket piece.
6. Prepare the side bottom panel
- Place the prepared pocket onto the side bottom panel.
- Align the top edge with the pocket guideline.
- Baste the side edges of the pocket to the side bottom panel within the side seam allowances.
- Repeat for the remaining pieces.
7. Assemble the shorts
- Place the side bottom and back bottom pieces right sides together.
- Match the side seam notches.
- Overlock the back side seam.
- Open the pieces from the seamline and press.
- Place the front piece onto the panel with the back already attached, right sides together.
- Match the front side seam notches and overlock.
- Repeat the same process for the other set of front, side, and back bottom pieces.
8. Attach the crotch
- Place both prepared shorts panels right sides together.
- Align the front crotch and back crotch seams.
- Overlock the crotch seams.
9. Sew the inseam
- Align the inseams of both legs.
- Overlock in one continuous seam.
10. Assemble the skirt
- Place both skirt pieces right sides together.
- Align the side seams.
- Overlock both side seams.
11. Finish the hems
- Fold the hem of the shorts to the wrong side and press.
- Cover-stitch the hem on the right side so the neat double stitch line shows on the front.
- Repeat the same process for the skirt hem.
12. Complete the final assembly
- Align all waist edges.
- Overlock to attach the bodice, shorts, and skirt into one garment.
Ready to Sew Your Own Swim Dress?
The Winslet's Bruna Swim Dress is a fun, practical project that combines activewear comfort with a flattering silhouette. With built-in shorts, pockets, and a stylish crisscross back, it is a rewarding make that you will want to wear all season long.
Purchase the pattern and start sewing your own Bruna Swim Dress today. Happy sewing!
Join the Community & Get Support
Share your finished Bruna Swim Dress on social media with #MadeWithWinslets. If you have questions, feedback, or customization requests, contact the Winslet's team at support@winslets.com.
