(I was also under the impression that the very same pair of trousers that fit me tightly the day before yesterday fit me loosely yesterday. No idea what the hell was going on there.)
Some cotton fabrics shrink in the wash and stretch when worn. I have a pair of jeans that is quite uncomfortably tight immediately after washing, somewhat tight the day after, and fits reasonably until the next wash. Your body may not be what is changing here.
FWIW, I’ve also experienced the same thing.
Some cotton fabrics shrink in the wash and stretch when worn. I have a pair of jeans that is quite uncomfortably tight immediately after washing, somewhat tight the day after, and fits reasonably until the next wash. Your body may not be what is changing here.