So I've been trying to avoid polyester & lycra in jeans and trousers, going for 100% cotton. I know that cotton will of course stretch when worn and therefore I usually buy jeans on the tight side to account for this. Recently though, I've really noticed that cotton jeans & trousers go saggy (not just merely a bit looser) really, really quickly and particularly at the knees. Why is this? Poor quality cotton?
Is there anything I can do to rescue my saggy kneed jeans?! They fit fine everywhere else!