How to Sew a Boys Swimsuit so it Won’t Sag

I have 3 boys that all have narrow little waists and hips! In order to get swimsuits that won’t show off their little behinds when they get wet, I have to buy suits that are way to small and short. My sis in law showed me this handy little trick to cinch their suits so they won’t slip!

Here is Davis’ suit before:


It doesn’t look too bad, but once his suit gets wet it will slip down too low. First I measure about how much it is going to need to go in on each side.

Then, turn the swimsuit inside out.  I sew right near the elastic, but not onto it. That way even if the waist is really tight they can still get it over their little bum.

  I start to sew right where the suit needs to be taken in.

Then sew down in a diagonal to the bottom of the waist. I sew it forward and then reverse it a few times.

 So it looks like this when done:

 Then when they put it on it is snug and tight against their hips.


I’ve taken some of my boys suits in almost an inch on each side. It’s not that noticeable and now my boys no longer run around with their little bums exposed.

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Previous author of Over the Big Moon. I shared my passion for home and family life! I love graphic design, DIY projects, cooking, and working in my garden! My favorite role is taking care of my husband and our 3 amazing and busy boys!


  • I’m sending this link over to MY sister in law…her boys have NO BUMS and their swim suits are ALWAYS falling down! Maybe this will be helpful to her!

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