How to Make Your Own Bikini By Copying One You Already Have

11 Materials
3 Hours

Whether summer is starting or just ending for you, knowing you’ve got a bikini ready for you to wear can feel pretty awesome. Knowing how to make your own bikini may not be up there in things you want to learn but I thought it might be fun to learn how to make a bikini.

I used my sewing skills and made a triangle bikini top sewing pattern and learned how to sew bikini bottoms (though that part was challenging!).

If you’re ready to come along with me on this journey of how to make a bikini and even better, how to sew a bikini, come along! The beach is waiting for us!

Tools and materials:

  • Swimwear fabric and lining: ¾ yard each
  • Swimwear elastic - ¼ to ½ inch
  • Own well-fitting bikini
  • Paper
  • Pen
  • Scissors
  • Ruler
  • Pins
  • Sewing machine
  • Serger
  • Safety pin

Please note that this is not professional. Follow along as I make this bikini and use the steps if you dare to make your own!

Cutting out the pattern pieces

1. Make the pattern

I used my own well-fitting bikini to make my pattern.

Adding coverage to the bikini bottoms pattern

I traced out the original shape onto paper and added a bit more coverage as well as seam allowance.

Triangle bikini top sewing pattern

On the bottom of the bra cups, I added about ¾ inch (1.5 cm) additional to fold over to make the casing for the strap. I also extended the bra cup a bit because my old bikini was barely covering me. You may wish to do the same! 

DIY bikini sewing pattern

Lay the paper pattern on the fabric and cut out the pieces in the lining and the shell fabric. I had 2 bra shell pieces, 2 bra lining pieces, 2 shell back pieces, 2 lining back pieces, 1 bottom front shell, 1 front bottom shell, and 3 strap pieces.

The longer strap goes across the chest and the two shorter ones are for the neck. I measured the strap length from my old bikini. The width of the straps is 1½ inches (4 cm).

Folding the straps

2. Sew the straps

Start with the straps first. The technique will be the same for all of them. Fold the strap fabric in half, right sides together.

Laying elastic close to the fold

Lay the elastic on top close to the fold.

Serging the elastic onto the folded strap

Serge the elastic directly to the folded strap along the entire length of the strap. If you don’t have a serger, use a zigzag stitch. Trim any excess. 

Using a safety pin to turn the fabric

Use a safety pin to turn the strap right side out.

Straps for the DIY bikini

This is what it should look like. Repeat for the other two straps.

How to sew a triangle bikini top

3. Sew the bikini top

Place the bra cups with the lining right sides together. Pin each cup.

Sewing the lining to the exterior fabric

Serge the side seams, leaving the bottom unsewn. Insert the neck straps in between the two layers. Sew across the top using the regular sewing machine, using a straight stitch.

Flipping the cups right sides out

Flip them right side out. Serge the bottoms.

Sewing a basting stitch across the serged bottom

Sew a basting stitch across the serged bottom.

Pulling on the basting stitch to gather the bottom

Pull on the basting stitch threads to gather the bottom a bit.

Pinning and sewing the strap casing

Use one of the straps to measure how much of the fabric to fold over to make the casing for the chest strap. Pin and sew the casing in place.

Make your own bikini top

Repeat for the other bra cup. Insert the long chest strap through both casings on the bra cup bottoms using a safety pin.

How to make a bikini top

You should have something that looks like this.

How to sew bikini bottoms

4. Sew the bikini bottom

Start with the back pieces. Lay the lining and outer shell pieces separately, right sides together. Sew down the center back seam only.

Laying the front and back pieces together

Lay the front and back pieces right sides together, with the lining and outer shell fabric separate.

Sewing the gusset for bikini

Serge the gusset (crotch) of the outer shell. Use a straight stitch on the lining gusset.

How to sew a bikini

Lay the front and back pieces right sides together.

Sewing elastic onto the leg openings

Pin and sew a basting stitch on the leg openings. I find it makes sewing the elastic less stressful and more accurate once it’s been basted stitched.

Lay the elastic on the seam allowance and serge the elastic along the leg openings. 

Turning the bikini bottoms inside out

Turn the bottom inside out.

Joining the side seams

To join the side seams, take the front and back with the outer shell layer and lining to each side.

Serging the side seams

Serge each one. 

Folding over the waistband

Fold over the waistband. Open the straight seam on the lining gusset and pull the fabric through.

Serging elastic across the waistband

Serge the elastic across the waistband. It’s slow going to do this, an inch or two at a time, so do this with patience.

Reminder: I made this my own way so you may want to watch a professional bikini maker make a bikini bottom! If you want to see how I did this, watch my struggle on the YouTube video from 9:30 to 10:45.

Turning the bikini right sides out

It took me a while to turn the bikini bottom right side out with the waistband sewn down through the open lining gusset. But I did it!

Sewing up the lining gusset

I sewed up the lining gusset and ran to the beach to show you how it came out!

How to make your own bikini

How to make your own bikini

How beautiful is this bikini?

DIY bikini

I hope I showed you how to make your own bikini and it works for you as well.

Bikini sewing tutorial

Please let me know in the comments what you think about this sewing bikini tutorial or if you made one as well!

Suggested materials:
  • Swimwear fabric and lining: ¾ yard each
  • Swimwear elastic - ¼ to ½ inch
  • Own well-fitting bikini
See all materials

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