Stretch swim trunks with a lined front gusset for comfort, side-seam construction, and a soft fold-over elastic waistband finished with a twin-needle hem.
These boys' swim trunks are built from a front and back leg piece plus a side part on each leg, with a lined gusset for comfort and a soft fold-over elastic waistband — no zippers or closures needed.
Sized from 3 to 8 years (98–128 cm height).
For swimwear, we recommend fabric mostly made from nylon, with at least 10–20% Lycra or spandex. Polyester blends with the same percentage of spandex also work well.
For sewing, use special needles marked STRETCH 65.
Tap a size to see it highlighted across the table. Values shown in cm / in.
| Height (cm) | 98 3 y |
104 4 y |
110 5 yMOST PICKED |
116 6 y |
122 7 y |
128 8 y |
|---|---|---|---|---|---|---|
| Main fabric | 25 cm 9.8" |
25 cm 9.8" |
27 cm 10.6" |
29 cm 11.4" |
30 cm 11.8" |
30 cm 11.8" |
| Lining fabric | 23 cm 9.1" |
24 cm 9.4" |
25 cm 9.8" |
26 cm 10.2" |
27 cm 10.6" |
27 cm 10.6" |
When buying fabric, keep in mind that the material can shrink, so take a margin of 5–10%.
| Pattern piece | Pcs. |
|---|---|
| Main fabric | |
| 1 — Back pant leg | 2 |
| 2 — Front pant leg | 2 |
| 3 — Side part | 2 |
| Lining fabric | |
| 4 — Gusset | 2 |
| Support pattern | |
| 5 — Elastic into the waistband | 1 |
Attention! All our patterns already contain 1 cm / 0.39" seam allowances.
Cut out the swimming trunks details from the main fabric. Cut out the gusset from the lining.
Serge the outer curved edge of the gusset details. Press.
Pin the gusset details together with the right sides along the inner curved edges (crotch). Serge it.
Pin the back details together with the right sides along the crotch and serge it. Pin the front details together with the right sides along the crotch and serge it.
Pin the side details to the back with the right sides together, aligning the notches. Serge it.
Pin the side details to the front with the right sides together. Serge it.
Pin the front and back together along the inseam with the right sides. Pin the gusset to the inseam with the right side to the wrong side of the back. Serge it.
Press the gusset to the front.
Pin the gusset to the front upper hem and baste it.
Stitch the elastic into a ring.
Pin the elastic to the upper hem of the garment (to the wrong side).
Serge it.
Fold the elastic inward and pin. Sew in place using a twin needle.
Fold the bottom hem of the trunks and pin, making sure the gusset is pinned to the front. Sew in place using a twin needle.
