Our pal from CoolThings went to the New York Comic Con 2012 and came back over 90 photos of cosplayers strutting their stuff - they're all in this one post: Link - Thanks Sunny!
I imagine that Barf from Spaceballs shown above was going around the convention saying, "Funny, she doesn't look Druish" to everyone who'd listen to him.
Pick a character that's your body type.
Major major props for remembering that rule!