criticizing the dress and price tag..

Very good points. Especially the bit about a bride on her wedding day. She's nervous enough. Unless you're going to say "you look absolutely stunning honey," don't open your mouth at all. I don't know what the heck it is with some people who will not hesitate to tell the nerve wracked bride that her lipstick is all wrong, her makeup too dark, the clothes not quite right, etc. If you don't have something nice to say, SHUT UP and don't spoil it for her.

Sorry for shouting. :)