Id treat you like a royalty.
I've seen weirder, wouldn't bother me.
Of course I'd welcome you. You could come in totally nude and painted green from head to toe with purple testicles (I saw a guy like that at a party once in college) and I'd just grin and wave. I totally believe in self ex<x>pression. Anyway, Halloween is coming.
As long as you are not knocking stuff to the floor and breaking things, you can shop.