OK, so to summarize the very helpful "crossdressing - you're doing it wrong" tips so far, in no particular order:
1. Boobs on back.
2. Pantyhose over head while in a bank.
3. Wearing men's clothes when you are, in fact, a man.
4. Underwear on the outside, if not a superhero or Madonna.
OK I'll make a list and post it on my front door so I can check myself before I go outside