I always try to look at a waitresses badge to catch her name. I'd just ask your bosses if you could have a badge without your photo; I think it is for their benefit so the customer can compliment/complain about a waitress and they know they've got the right one. I don't think the customers are looking at your size/weight at all, more like trying to get into their own thick heads your name and what you look like so they can treat you like a human instead of a servant, call you by name instead of looking around for you if they want you and not being sure and then just grabbing any waitress and calling her "ma'am" or "girl" or "waitress", etc.