Why do my jeans always gap in the back? (Explained & Solved)

Jeans’ back gaps are the worst, so here’s how to adjust the waist of your jeans.

Shopping for jeans is horrible! You spend an eternity looking for jeans that fit your legs, hoops, and boots in a semi-decent way. Then you try on the perfect pair only to discover that there is a large gap exactly at the waistline.

It doesn’t matter if you’re a curvy female or a tiny lady; this is a very typical issue with trousers. If you can fit a hamburger in your back waistband, your pants are in desperate need of repair. The good news is that adjusting your jeans waist is a pretty easy adjustment that requires very little stitching.

Now, say goodbye to your plumber boots and allow us to show you how to mend your jeans!

Why do my jeans have a back gap?

The question of the day is, why does the waist of jeans happen in the first place?

The solution is simple! A straight line cannot be used to suit a curve. Your boot has a curvature, and the waistline is too large.

The combination of the two results in a waistline that begs for some tailoring.

A contoured waistline is found on higher-quality jeans and pants designs. Contoured waistbands help to provide the appropriate curvature in the back. Essentially, we’re going to hack our way back into that straight waistline, which will patch up that awful gap.

Now, if you build your own jeans, you may follow some of these similar methods and achieve a better outcome. This is due to the fact that the surplus may be removed from the pattern pieces themselves.

That being said, this easy adjustment will improve the fit of any pair of jeans or denim skirt in your collection by roughly 80%.

how to fix gap in back of jeans


  1. Needle for Denim.
  2. Heavy duty pins
  3. Ruler
  4. Washable marker
  5. Scrap denim/seam ripper


  1. Put Your Jeans On

The first step toward resizing your jeans waistband is to try them on!

Putting on your pants will tell you all you need to know.

  1. Remove any excess

After that, get some pins. If you’re using a dress form like me, place the jeans on the hips of the dress form first. Then, using your dress form as a guide, secure the side waist and center front. This will assist you with pin placement accuracy.

Then, on either side of the center back, pin out two darts. Use a second pin to fix that dart and keep it from slipping on a dress form.

Belt loops might get in the way of where the darts want to go. If this is the case, tear them out with a seam ripper. Save these since we’ll need them later.

Feel to the rear and pin out the darts as best you can if you’re working on your own body.

The most important aim here is to reduce the size of the rear waist. At this point, the dart does not need to be precise.

  1. Darts are being marked

Grab your washable marker after you’re satisfied with how the waistline feels with the pins. Then, on either side of the pin, mark the top of the waistline.

Now, double-checking is crucial!

  1. Make sure your darts are in the right position

We’ll need to do a little math here.

Next, from mark to mark, measure the breadth of each of your darts. If they aren’t even, divide the overall measurement by two.

Let’s assume one dart is 1 inch long and the other is 2 inches long. Each of your darts should be 1.5 inches wide. It’s so simple!

Check the darts’ horizontal location now. Each dart should be measured from the center back to the first marker. If they’re in different locations, divide the total distance by two.

One of my darts was 4 inches from center back, while the other was 2.5 inches. When I’m pinning, I clearly favor one side!

To obtain an even measurement, I’ll mark 3.25′′ on both sides of the center back. So I wouldn’t be confused, I adjusted the marker colors.

Make a second mark apart from the adjusted mark you just created to complete this step. The second mark must be the same width as the dart.

Now it’s time to finish these darts!