No offense...but what's up with fat people wearing clothes that don't fit them

I see 180-pounders squeezing into a pair of Lululemon pants all the time, which btw is not sexy AT all. People usually buy trendy clothes to look good right? so if you're fat why would you spend the big bucks on clothes that make you look like a rice dumpling ("zhong")? They could buy clothes that flatter their body instead for example the poncho that Homer wore when he was SUPER fat
If i offended anyone on this forum please accept my apology, i just wanted to know why fat people where clothes that dont fit.