Sounds like something my mother would do. Only with Knives not Pants.
I collect knives, good knives, rare knives, things that I find interesting. I think the last 8 gift giving occasions, birthday, xmas, etc. I've gotten some cheap-o made chinese/korean/pakistani order out of a "gift" catalog type knife. I almost want to hand them back to her, but I'm nice. They end up being regifted to Boy Scouts making Eagle or the like.

You can try what I tell my mom......"why don't you get it, no more ______"
insert trousers for your case. Hope they get the hint.