How to Make a Super Cute DIY Bikini

by VeganVenus
13 Materials
1 Hour

Today I’m going to be making a super-cute, but very simple DIY bikini, with a little ruching effect in the front, and crisscrossed straps in the back. If you’ve never worked with swimwear fabric before, I suggest you watch my videos on it here before getting started. You will see that I also had a few hiccups during the process, but this will teach you what not to do, and I will show you how I fixed my mistakes. Let’s get this DIY bikini tutorial started!

Tools and materials:

  • Swimwear fabric
  • Paper
  • Marker
  • Ruler
  • Measuring tape
  • Scissors
  • Pins
  • Safety pin
  • Seam ripper
  • Wide elastic band
  • 5 mm elastic band
  • Sewing machine
  • Serger (optional)
Make a DIY bikini

Create a pattern

I used the instructions above to create the pattern for my bikini top. For the bottoms, I used a pattern I already had. You can use any underwear or bikini bottoms you already own, and trace around them, making sure to leave seam allowance as you trace around it. 

How to make a DIY bikini


Next, I cut out each pattern piece twice, since I was using the swimsuit fabric as my lining. 

Simple DIY bikini

Pin and sew

I pinned the two bottom front pieces together and the two bottom back pieces together, both with right sides facing, and sewed them together, leaving a small gap in the stitching so I could turn them right sides out afterward. 

Sew a DIY bikini

Next, I attached the side pieces to the top front pieces. I used a serger for this, but you can also use a zigzag stitch on a regular sewing machine. However, I do recommend using a super stretch needle. If you have a non-stick presser foot, you should use that, as well. 

How to sew a DIY bikini

After that, I pinned my top pieces together, with right sides facing, and sewed them together, leaving small openings in the stitching at the top corners, so I can run the straps through them later. 

Basic DIY bikini

Attach elastic

Next, I attached elastic bands to all the edges with a zigzag stitch. I used a thicker elastic band for the underbust to make it a little more supportive. 

DIY bikini tutorial

For the rest of the edges, I used a 5 mm (1/4 inch) elastic. I did not attach any elastic to the top edges. 

I also applied 5 mm (1/4 inch) elastic to all the seams on the bottom parts of the bikini. 

Turn right side out

I then ripped a small area of one side seam of my bikini top, so I could pull the fabric through and turn it right side out. 


The next step was to sew straight across the top edges of the bikini to create a little tunnel for the straps. Unfortunately, I lost the footage for this step, so I’m showing you the finished product here. 

Pin and sew

Next, I folded, pinned, and sewed down the side edges of the top to create tunnels for the straps. I also topstitched the side seam closed where I had ripped it previously. 

Create straps

Then I sewed what felt like one million straps, but in reality, it was only four really long ones. I can’t tell you exactly how long, because I eyeballed it. But they were all about 3 centimeters (1 inch) wide.  

Insert bottom straps

With the bottom pieces still inside out, I inserted the straps through the open crotch seam, and pinned and sewed them down at the sides. I did this for both the front and back bottom pieces.

Pin and sew

Then, I turned the front bottom piece right side out and inserted it into the back bottom piece, which was still inside out. I made sure that all the straps were inside, and away from the crotch seam.

Making sure the crotch areas of the front and back pieces were perfectly aligned, I pinned them together, and sewed them down, leaving a gap in the center of the seam so I could pull the fabric through to turn the bottoms right side out.


Then I hand-sewed the opening in the crotch seam closed. 

Insert the straps in the top

I attached a safety pin to the end of the straps and pulled them through the tunnels along the top and side edges. 


Then I tried it on and realized the “V” part in the front was way too deep, so I closed that up a little. And then I was done!

I absolutely love the color and floral pattern on this fabric and think the whole thing came out ridiculously cute. I hope you use my tutorial to make a DIY bikini of your own, because I think you’ll do great, and you’ll totally rock this swimsuit. Let me know in the comments what you think of my basic DIY bikini.

Suggested materials:
  • Swimwear fabric
  • Paper
  • Marker
See all materials

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