How to Sew Swim Trunks Tutorial

Updated: May 9, 2021

In this article, we will show you how to sew swim trunks. We are sewing the swim trunks in size 98, 3 years. And we are using the Happy-Sewing Trevor swim trunks sewing pattern. If reading is not your thing, you can see how we made the DIY swim trunks in the tutorial video at the bottom of the page.




The Equipment

What we need to make these shorts are cutters, fabric, some elastic band, and the sewing pattern.

We are using scissors, Rotary Cutter, Clips, Gluepen, Pins, Elastic band, the fabric, and the sewing pattern, So a few more tools to make the process easier. if you want to read more about the tools I have and recommend you can click here.




Cutting the Fabric

We are using the happy-sewing pattern to make these swim trunks. We cut two back panels, two front panels, and two side panels.

The fabric we are using is Lycra, a fabric that is made for swimwear.

The Lycra fabric is slippery, so fasten the pattern with pins and be careful while cutting. Please don't put any heat on the Lyca fabric. If you try to press it, It will melt, and the trunks will be ruined, leaving a mess at the same time.

The Pattern pieces:




Joining the back and side panels.

We join the back and side panels, first, we apply glips and then we add some glue. We have all the fabric inside out when we line them up. The Lycra fabric is so slippery. Using glue will help to keep things in place.

We sew the seams using stitching that is made for stretchy fabric and polyester threading.

I used my Baby Lock Victory serger and overlocked these seams.