This is why the butt on your jeans is sagging

(Instagram/some.lovely.stuff)

Notice your jeans have started to sag a little in the rear? Not to worry, it’s got nothing to do with your body.

Likely, the material of your jeans are to blame.

Over the last few years, stretch denim has taken over the jeans market. Blame the “skinny” movement which, with the invention of stretchy fabric, has made painted-on denim accessible to the masses.

ALSO SEE: These Levi’s jeans want to give you a wedgie. Really.

But it hasn’t always been that way.

Traditionally, jeans were made of 100 per cent cotton, which depending on the quality, could result in some pretty stiff stovepipes. That said, these wouldn’t lose their shape no matter how hard you were on them. In fact, they would get better with time.

ALSO SEE: This is (apparently) the reason your jeans have a tiny pocket

But most of us don’t have time to work in jeans anymore, so In order to achieve a more comfortable fit that would instantly mould to the shape of the body, manufacturers began incorporating spandex into the material. The only problem is that spandex breaks down over time, so jeans lose elasticity and shape. The result: sagging at pressure points like the knees and derrière.

So, what’s the solution?

For jeans you hope to keep for years to come, make the investment in a pair of 100 per cent cotton that need to be properly worked in and save the stretch denim for more trendy looks that you likely won’t keep past a season.

Did you find this helpful? Let us know by tweeting to @YahooStyleCA.