If you are the parent of a big child, do not, I repeat, do not dress your child in all purple. Depending on the distribution of the bigness, your kid is either going to look like Barney or the Snooty Bitch after she blew up in Willy Wonka. The Purple People Eater is not a cute nickname.
If you are a big grown up, do not wear a shirt advertising "Lose 3 Sizes in 10 Minutes". Either the shit your advertising didn't stick, or you were huge as a freaking whale when you started.