Swimwear · Intermediate
Bikini top sewing pattern
Triangle bikini top that ties at the neck and back.
Choose your size
Each size has its own page with the full pattern, the cutting list and the measurements used.
Pattern preview
Sewing instructions
General steps to sew this garment. Seam allowance is 1 cm (3/8") unless stated otherwise.
Supplies
- Swim elastic and swim lycra
- Matching thread and the right needle
- 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.
- Line each cup, sew the edges with elastic and turn.
- Make the ties (turned tubes or folded strips), sew them in place and test the fit.
- Sew swim elastic to the wrong side of the neckline, armholes and leg openings with slight stretch; fold it over and zigzag.
Cutting list
| Piece | Cut | Material |
|---|---|---|
| Neck tie | 2× | Main fabric |
| Cup | 4× | Main fabric |
| Band tie | 1× on the fold | Main fabric |
Measurements needed
| Measurement | How to measure |
|---|---|
| High bust circumference | Around the torso, under the armpits and above the bust. |
| Chest/bust circumference | Around the torso at the fullest part of the chest, tape level. |
| Underbust circumference | Around the torso, just below the bust. |
| Waist circumference | Around your natural waist, the narrowest part of the torso. |
| Waist back | Back part of the waist circumference, side to side. |
| Bust span | Horizontal distance between the two bust points. |
| Neck circumference | Around the base of the neck, where a shirt collar sits. |
| Shoulder to bust | From the high point of the shoulder (next to the neck) to the bust point. |
| Front length | From the high shoulder point, down the front, to the waist. |
| Back length | From the high shoulder point, down the back, to the waist. |
| Shoulder width | From one shoulder point to the other, across the back. |
| Shoulder slope | Shoulder angle in degrees (usually between 10 and 15). |
| Bust point to underbust | Vertically, from the nipple to the crease under the breast. |
FAQ
Is the bikini top 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 13 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.
