So my sense of size is terrible. I routinely will look at clothes I order thinking that they're huge and that they MUST be too big, only to try them on and they fit perfectly or are even snug. Like, my mental image of myself is a lot smaller than I actually am for some reason. I get surprised a lot when I'm too big to fit in something, or barely fit, or I'm too heavy for something. Stuff like that. I'll complain about this stuff to a friend and they'll just be like "are you really surprised with how big you are?"
And like, yes! Which tbf, more stuff should be able to handle fat people properly, given how many people are fat.