What do you call this problem in the knee area of the jeans?

What do you call this problem when your pants, especially jeans, look like sticking out in the front and look as if there is a pillow on their knee part? (As if it has taken the shape of the knee.)

I don't mean "to be worn out", "to get folded or creased", or "to get faded". Unfortunately, I don't know how else to describe it, I mean exactly the way it is shown in the following picture (by arrow).

For example:

"I don't like it when my jeans ____(at the knees)."

Solution 1:

I would suggest "bunch up". When clothes are said to be bunched up, it means that the material is folded up, usually in an uncomfortable or unsightly way, instead of lying flat.

Here is an example of an image search result for "bunched up jeans":

Solution 2:

I have to disagree with one of the other answers: "knee bags" are not actually a thing. (As in, I've never heard anyone use that expression, and it sounds vaguely disturbing — like a disease, not an innocent description of clothing.) It's not the word choice, though, but the ordering: I'd describe the pants in the picture as being baggy in the knees, or having baggy knees.

I don't like wearing jeans when they get baggy in the knees.

Solution 3:

I don't know if there is a standard term for that, but I would call it a bulge, or say that the jeans bulge out at the knees.

(To prevent that from happening, by the way, when you sit down you should grab the fabric above the knee and hitch it up an inch in order to create some slack so that there will be less strain on the fabric.)

Solution 4:

Those are called knee bags. Many people have problems with them but sometimes they are considered cool.

Solution 5:

When clothing or fabric is supposed to fit snugly but instead hangs loose unintentionally, as if it's lost its tightness, it can be described as sagging.