How to Make a Cute DIY Triangle Bralette Out of Old Track Pants

Pam Oduor
by Pam Oduor
7 Materials
30 Minutes

In today’s tutorial, I’m going to be making a DIY triangle bralette to complete a 2-piece skirt set. This bralette was made from old track pants. It's both sporty and stylish and is super easy to make. If you want to know how to sew a bralette, keep reading!

Tools and materials:

  • Old pants 
  • Measuring tape
  • Scissors
  • Fabric chalk
  • Pins
  • Sewing machine
  • Elastic
Taking measurements for the bralette

1. Take measurements

First, we need to take measurements. The first measurement is the height of your bust, so measure from the top of your bust to just beneath it. Mine comes out to around eight inches. This measurement will be the two sides of our triangle.

Measuring the width

The second measurement is the width. Mine came out to around seven inches. This measurement will be the base of our triangle.

Measuring and marking the fabric

2. Measure and mark

I’m using two pieces of scrap fabric from a pair of pants from a previous tutorial to create the top as it’s for a matching set. Start by folding the pant leg in half, then draw a line for the reference point.

How to make a bralette

Measure and mark the width of your underbust - mine was seven inches. Here is the bottom of our triangle. Then, mark the midpoint - mine is 3.5 inches.

DIY bralette sewing pattern

To find the top of your triangle, measure and mark the height of your bust - mine was 8 inches.

Drafting the bralette sewing pattern

Measure and mark the sides of the triangle with that same measurement.

Curving out the bralette sewing pattern

Join the points, not forgetting that the bottom part is going to be a little bit curved. This will be the shape of the bralettes. 

Cutting out the triangle cups

3. Cut out the triangle

Pin the layers together and then cut following the lines, leaving a half-inch of allowance.

Flipping the fabric

4. Flip

Your bralette should have two layers, so now you should flip them so the wrong side is outside and the right side is inside. So when we sew and then flip it over, it’ll be a perfect bralette. 

How to sew a bralette

5. Pin and sew

Pin the sides together first. 

DIY bralette tutorial

Next, place the elastic between the two layers so when you sew it together, you sew the strap inside.

Sewing along the sides

Then, sew along the sides.

Adding elastic to the triangles

When you flip it right side out, the elastic should now be at the top of the triangle.

Connecting the triangles

6. Repeat

Repeat with the other end of the elastic and the other triangle to connect the two triangles.

Measuring the band

7. Measure and cut out the band

Using the other pants leg, measure and mark a band that has a length of 21 inches and a width of 4 inches.

Cutting out the band

Cut along the line.

Cutting out lining

I also cut out the lining.

Sewing the band and lining together

8. Sew together

Place the two layers so they’re right sides facing and then sew together, leaving one opening at the top.

Flipping the fabric right sides out

Then use the opening to flip it right side out. Iron it to get it flat.

Sewing the triangles to the band

9. Sew the triangles to the band

Fold the band in half to get the midpoint, and mark it. Then, pin one of the triangles to the band at the midpoint so they’re right sides facing, and then sew it together. 

Attaching elastic to the band

10. Attach elastic to band

Finally, sew elastic to the top and bottom of both ends of the band to connect it.

DIY triangle bralette with matching shorts

DIY triangle bralette tutorial

Here’s the finished DIY triangle bralette. This bralette sewing pattern is super simple to follow and you can make it in under 30 minutes! It’s such a fun upcycle and it looks great too.

Let me know what you think about this tutorial on how to make a bralette top!

Suggested materials:
  • Old pants
  • Measuring tape
  • Scissors
See all materials

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