How to Sew a Blazer Dress & Pants From Your Dad's Old Suit

Liana Hardy
by Liana Hardy
11 Materials
4 Hours

In this tutorial, I'll show you how to sew a blazer dress out of a men's suit jacket. My dad had an old suit lying around in his closet, doing nothing. So, I decided to create a formidable upcycle out of both the jacket and pants.

First, I made a DIY blazer dress from the blazer, and then I transformed the pants. So, if you want to know how to make a sexy blazer dress, this is the perfect tutorial for you. Let’s start!

Tools and materials:

  • Old suit
  • Sewing machine
  • Pins
  • Seam ripper
  • Ruler
  • Chalk or marker
  • Measuring tape
  • Thread
  • Needle
  • Scissors
  • Buttons (optional)
Seam ripping the shoulder and removing pads

DIY Blazer Dress

1. Adjust the shoulders

First off, I seam ripped the shoulder area and removed the shoulder pads. 

Shaping the should seam to be more fitted

Next, shape up the shoulder seam so that it is more fitted. Do this by reducing the width on the top. Use a pencil or marker to draw a line as a guide. Blend it into the middle seam of the armhole so it looks as natural as possible. Also, blend it in at the back. 

Reducing the shoulder size on the jacket

Unpick the shoulder seam to cut the area to reduce the shoulder part of the blazer. 

Fold your whole blazer in half and copy what you just did to the other shoulder seam. This will make the process quicker. Then, repeat the same steps to reduce the width. 

Changing the buttons on the blazer

2. Change the buttons

You can either leave the buttons on the blazer or if you want to jazz it up a bit, feel free to change them. 

Adjusting the neckline of the blazer

3. Adjust the neckline and bust area

Wear your blazer, and draw an imaginary line on how you want to modify the neckline. Also, this is the perfect time to see where you’ll reattach your buttons. 

Adjusting the bust line of the blazer

Now, draw the bust line properly using a ruler as a guide. The bust line should blend with the center back seam. Be sure to reflect the same to the other side. 

Cutting the bust line of the blazer

Now, fold the blazer in half, making sure it all aligns nicely. Then, cut the bust line all in one go, as shown.

Adjusting the center-back of the blazer

The center-back is a little oversized for me, so I decided to take it in. To see how I do this, skip to 4:48 minutes on my video. 

Cutting off excess fabric from the seams

4. Pin and sew the raw edges

Now, pin the raw edges, and cut off any excess fabric that doesn’t match up to the seams. 

Pinning the seams, both fabric and lining

Pin the center-back seam, and pin each layer separately; fabric to fabric, lining to lining. 

Sewing the blazer dress

Now, sew each layer together. 

Sewing the bias binding into the blazer dress

5. Add bias binding

Now, add bias binding to the neckline, do this all in one go. 

Taking in the sleeves of the blazer dress

6. Slim down the sleeves

The sleeves are a bit oversized, too. So, stitch the sleeve to your desired length and cut the excess. I took mine in by about 2cm (0.78 inches). 

Pinning the front of the blazer dress

7. Sew the front of the DIY blazer dress

Now, sew the front, overlapping part, as shown. 

Hand-stitching the front of the blazer dress

Hand-stitch it down and sew a button feature, too. 

Mini-buttons to keep the bust area closed

8. Add mini buttons

For a little bit more security around your bust area, sew invisible mini-buttons around the bust line by hand. 

Sewing the exposed shoulder seam closed

9. Finalize the shoulder seam

For the shoulder seam, hand-sew the remaining exposed seam. 

Pressing the DIY blazer dress

10. Press

Then, give your DIY blazer dress a good press, and you’re done!

How to make a blazer into a dress

DIY blazer dress

How do you like this stunning DIY blazer dress? It fits so great and shows just enough skin in the right places. I really love this sexy look, and I hope this tutorial gave you a pretty good idea of how to make a blazer into a dress! 

Taking in the suit pants at the back


1. Take the pants in

Wear the pants and at the back, take the extra fabric in and pin where necessary. Doing this at the center-back seam instead of the side seams will not destroy the pocket area. 

Pinning the pants at the back

Now, take the pants off and pin a better line, as shown. Following the pins as a guide, draw a line where you’d like it to be reduced. Blend the line in with the existing seam at the bottom. 

Cutting the pants to take them in

Now, cut along the line, as shown. 

Sewing the pants

Pin the raw edges, and sew the new seam line. Remember to combine it seamlessly with the existing seam. 

Tip: Overlock the center back seam after sewing.

Hand-sewing the hem of the pants

2. Hem the pants

Now, hem the pants to your desired length. Do this by ironing the new hem that you want, so that it stays in place and makes sewing easier, then hand-stitch it together. Press to finish.

Tip: Grab the inside of the hem and a little bit of the front layer of the trousers, so if you pick up a little bit of the fabric it won't be obvious that it's a hand-sewn hem because it will look like a blind hem.

DIY sexy pantsuit

DIY blazer dress / pantsuit tutorial

Now your pants fit like a glove. You can wear the suit pants and blazer dress separately, or you can pair them together to make a really cool pantsuit outfit. Let me know what you think of this tutorial and the finished garments in the comments below.

Suggested materials:
  • Old suit
  • Sewing machine
  • Pins
See all materials

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Join the conversation
 1 comment
  • Diane Bates Diane Bates on Aug 23, 2021

    I like the suit jacket the most, I like the pants I just would have the pants a lot slimmer, but they are still nice.