Exactly.  You'd think corsets would be ideal for fats because it forces a curve and pushes pancake-breasts up so they look perky, but using actual corsets would require fats to be intelligent about their fashion decisions (e.g., expecting Caleb Luna to not have a curly mohawk, thick-rimmed glasses and a septum piercing--even the thin gay men who like chubs don't like Tumblr creatures).