If you haven’t seen this video yet, WATCH IT NOW. Really. It’s awesome, I swear.
Thin people dress in fat suits not to validate the fat experience, but to mock and eliminate it. Really, I don’t think there’s any other reason. If they’re bad-intentioned, it’s to mock, if they’re good-intentioned, it’s to suggest costuming and playing at something is the same as being something, hence eliminating the true experience of fatness.