Dresses & jumpsuits · Advanced
One-piece sewing pattern
Versatile one-piece: swimsuit, pajamas or romper.
Choose your size
Each size has its own page with the full pattern, the cutting list and the measurements used.
Women's sizes (with bust)
Pattern preview
Sewing instructions
General steps to sew this garment. Seam allowance is 1 cm (3/8") unless stated otherwise.
Supplies
- Four-way stretch fabric
- Swim elastic and swim lycra
- Matching thread and the right needle
- Prewash and press your fabric before cutting so it will not shrink after sewing.
- Print the pattern at 100%, check the test square and cut the pieces following the cutting list. Transfer notches, darts and button marks.
- Cut with the greatest stretch running horizontally (around the body). Use pattern weights instead of pins so the knit does not distort.
- Sew knits with a serger or a stretch stitch (narrow zigzag) and a ballpoint needle.
- Join the raglan sleeves to the front and back; watch the notches (double notch = back).
- Sew the outseams, then the inseams of each leg.
- Put one leg inside the other, right sides together, and sew the crotch seam in one go, matching the inseams.
- Sew swim elastic to the wrong side of the neckline, armholes and leg openings with slight stretch; fold it over and zigzag.
- Fold up the hems (sleeves and body) and stitch with a twin needle or zigzag so they keep their stretch.
Cutting list
| Piece | Cut | Material |
|---|---|---|
| Front | 2× | Main fabric |
| Back | 1× | Main fabric |
| Raglan sleeve | 2× | Main fabric |
| Neckband | 1× | Main fabric |
| Zipper guard | 1× | Main fabric |
| Crotch gusset | 1× | Main fabric |
Measurements needed
| Measurement | How to measure |
|---|---|
| Biceps circumference | Around the widest part of the relaxed upper arm. |
| Neck circumference | Around the base of the neck, where a shirt collar sits. |
| Chest/bust circumference | Around the torso at the fullest part of the chest, tape level. |
| Waist circumference | Around your natural waist, the narrowest part of the torso. |
| Hip circumference | Around the hips, at the level of the hip bones. |
| Seat circumference | Around the fullest part of the buttocks. |
| Waist to hips | Along the side, from the waist to the hip line. |
| Back length | From the high shoulder point, down the back, to the waist. |
| Front length | From the high shoulder point, down the front, to the waist. |
| Waist to seat | Along the side, from the waist to the fullest part of the buttocks. |
| Cross seam | From the front waist, between the legs, to the back waist. |
| Waist to armpit | Vertically along the side, from the waist to the armpit. |
| Inseam | From the crotch to the floor along the inside of the leg. |
| Thigh circumference | Around the top of the thigh. |
| Waist to thigh | Along the side, from the waist to the thigh line. |
| Ankle circumference | Around the ankle, over the ankle bone. |
| Wrist circumference | Around the wrist, over the bone. |
| Arm length | From the shoulder point to the wrist, arm slightly bent. |
| Head circumference | Around the head, above the eyebrows and ears. |
FAQ
Is the one-piece pattern really free?
Yes. Every Kutopy pattern is free, with no sign-up and no watermarks. You can sew and sell what you make.
Which measurements do I need?
This pattern uses 19 body measurements. If you don't know them, pick a standard size or follow our measuring guide.
Does it include seam allowance?
Yes, it includes 1 cm (3/8") seam allowance (outer dashed line). You can remove it in the editor.
How do I print it at full scale?
In the editor pick your paper and tap "Download PDF". At home: numbered Letter or A4 pages you tape together. At a print shop or plotter: full size on one sheet, a 36" roll or large sheets. Always print at 100% and check the 10 × 5 cm test square.
