Free Bikini Top Sewing Pattern: 1 Pattern=12 Styles

Are you looking to expand your swimwear collection with a Free Bikini Sewing Pattern? You’re in luck! You won’t need to buy or make dozens of bikinis. Today, I’ll show you how to sew a versatile bikini top that can be styled in 12 different ways!

The best part? You only need a single (and free) sewing pattern!

The Aster bikini top is exactly what you’ve been looking for. It’s perfect for beginners, so don’t worry if you’ve never sewn swimwear before.

Grab your favorite fabrics, and let’s dive into this fun sewing project together!

NOTE: This post contains affiliate links, which means that if you make a purchase using one of the links in this article, I may earn a commission at no extra cost to you (To know more about this, click here.)

If there is a MUST-HAVE bikini top pattern you should own, it is the Aster Bikini Top. 

This pattern is exactly what you need if you hate repeating outfits and don’t want to spend hundreds on new garments. 

As far as I have counted, this one piece alone can make up to 12 different versions. So it’s like having 12 outfits for each pool party! 

Now, the great thing about this swimsuit pattern is that it is super beginner-friendly.

You don’t have to have previous experience in swimwear. However, if you have never sewn knit fabrics before, I recommend that you first read our How to Sew Stretch Fabrics 101 Guide before jumping into the sewing tutorial.

After you read that, let’s proceed with our free sewing pattern.

About this pattern.

The sewing pattern we are going to sew today is the free version of the Aster Top Bikini Pattern. 

As with some of my free sewing patterns, I am sharing my own size of the pattern for free. This pattern is small and should fit a chest girth of 40″-42″ (which is a medium). 

BUT! If you want a wider size range and an upgrade to this pattern, you can always get our Full Aster Pattern Version.

The difference between the free and paid versions is that for just a few bucks, you can get the Aster Bikini Top Sewing Pattern in all sizes, ranging from 30″ to 58″ chest girth, in all printing formats (Letter, A4, A0, and Projector files), and an ad-free experience with its own digital PDF instructions and support sewing tutorials. 

I love that I can give you this option for wider sizes on patterns! Choose whichever option suits you the best, and follow the instructions to print and assemble your pattern.

As for the fabrics, I am using swimwear nylon spandex with at least 75% 4-way stretch. Consider putting cups on this top. I will link those on the material list below.

How to Sew a Bikini Top Sewing Pattern

Materials. 

• Aster Bikini Top Sewing Pattern (or download free version at the end)
• 1 yard of 75% to 100% 4-Stretch Nylon Spandex
• Swimwear Cups (optional)
• ¼” Braided Elastic
• Matching Thread
• Serger Machine
• Sewing Machine
• Loop Turner
• Rotary Cutter
• Cutting Mat

1. Cut your fabrics

Ok, so let’s learn how to make a bikini top. Shall we?

Once you have downloaded and assembled your sewing pattern, follow the cutting directions to cut your fabrics with the correct grainline of the fabric. 

You will end up with two pairs of mirrored pieces (four pattern pieces total), which means you have to cut the pattern mirrored two times. 

2. Sew the channel opening

The first thing we have to do is make a snip cut on the base of the bikini top that is ¼” deep by ½” tall. Please follow the notch on the paper pattern so you don’t make a mistake.

Then, fold that piece towards the wrong side of the fabric and make a straight or stretch stitch to secure it.

3. Sew around the pattern piece.

Place the two mirrored pieces of the pattern with the right side of the fabrics facing together and pin them around to secure them in place. 

Cut four pieces of elastic 12” long and pin them from the end of the folded notch of the channel up. Follow the edge of the fabric. 

Now, you will sew all around the top body with your serger machine, leaving a space of about 3” open at the top of the strap. That way, we can turn our piece on the right side out later. 

As a note, you want to make sure the serger stitch covers your elastic completely so you don’t have problems turning your piece to the right side. Do not stretch the elastic while sewing it. 

If you don’t feel that confident sewing the elastic on the edge of your seams, you can opt not to include any. I strongly recommend you do, though, because putting elastic on the side seams will provide us with more support and structure.

But then again, the bikini will work, too, without it. Your choice!

Once you are done, use the open space to turn your pieces to the right side.

4. Form the channel

Use a pressing cloth and some steam to press the seams of your bikini tops. 

Then, form the channel for our spaghetti straps by sewing at ½” from the bottom edge. 

You can make this seam using a straight stitch or a stretch stitch (the one that looks like a lightning bolt).

5. Make the straps

Finally, we need to make our spaghetti strap. To do that, we will need a strip of fabric cut crosswise or on the bias that measures 65” by 1 ¼”.

Fold the strip in half lengthwise and serge along the length. Then, use a loop turner to turn your strap to the right side.

To finish this strap, you have two options. 

The first is to make a very tight knot on each end. The other cleaner option is to push the raw edges of the ends inside the strap and then close the open space with an invisible stitch by hand. 

Finally, use the loop turner to insert the strap through the channels of the base. 

6. Finishings

This step is optional but will give your stunning bikini design a more professional look.

The only thing you have to do is to make a couple of hand stitches on the seam joints of the opening channels so the serged seam doesn’t stick out.

Different ways to tie a bikini top

Omg! You did it! You have completed your amazing new bikini top. Now it’s time to learn all the ways you can style it. 

Here are some of my favorite options.

Multi Style Bikini Top PDF Free Sewing Pattern

To get the free version of this pattern, which fits a chest girth of 40”, sign up in the form below, and you will receive it in your inbox. 

The email should arrive in a few minutes. Remember to confirm your subscription so we can send you the pattern without any issues! The free version of this pattern comes in size “M” and has letter and A4 paper-size printable options.

Get the complete sewing pattern for more value!!

The complete version with full sizes of this pattern fitting sizes from 3XS (30″ chest girth) to 3XL(58″ chest girth) is now available for purchase!

With the purchase version, you will get all the sizes, plus the printable extra detailed instructions, to get an ad-free experience. We have also included links to support tutorials on special techniques for sewing this pattern. Plus, you will get the pattern on Letter, A4, A0, and Projector Files for your convenience.

Visit the Aster Bikini Top Pattern Page here to learn more.

Happy Sewing!