Tag Archives | swim bra

August 14, 2014

Tutorial: How to sew a swim bra into a swimsuit

Hey ladies! Want to sew your own swimsuit but need a bit more support than a layer of spandex? Then never fear, because it’s super easy to put a swim bra into your hand-made suit.


This is just the approach I took for my polka dot Bombshell – there are others, including putting elastic in to make a shelf bra (my bust LAUGHS at your shelf bra, but others may be in less need of industrial support), or actually making a swim bra out of foam and bra notions. However I took the easy way: I took a very old and worn out tankini, and seam-ripped the internal underwired bra out, and sewed it into my new suit.


1. Complete your suit to this stage: the front and back are attached, but you haven’t put the straps on yet.

2. Serge (or zig zag) along the top of the suit and lining to join them into one piece.

3. Place your swim bra over the front, making sure the underwire is at least 1/2 inch below the neckline (because you’re going to be folding it over with elastic to finish it). Remember to put it the correct way round, so the softer side will be against your body. I also put the sides of the cups about 1/4 inch beyond the side seam, to avoid too much bulk. Note, your bra may not perfectly match the shape of your suit: no worries!

4. Pin that baby! There was more fullness in the cups than in my suit, so I lightly tucked where necessary and pinned so that it would lie flat to the neckline

5. Stitch it down! Just stitch the neckline, and stop at the edges of the cups – the back strap will be free floating.  I used a narrow zig zag.

6. Trim off the excess if you have any (my swim bra was from a halterneck so had a lot of extra)
7. Now continue with making your swimsuit – the next step in the Bombshell is putting elastic along the neckline.
A couple of things to bear in mind:
– You will want to raise the back of the Bombshell into a less acute curve in order to cover the back strap
– You may also want to change from halter neck to straight straps – that’s super easy, just try on the suit with the bra in, measure the length that you need, make some fabric tubes, and feed bra straps or swimsuit elastic through them. You can see a technique for doing that here.
– Need to grade the Bombshell suit up? You can find my tutorial here.
Hope this is helpful! Let me know if you have any questions.

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How to sew a swim bra into a swimsuit! Tutorial by Cashmerette


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