Tons....but as in most things fashion, much comes down to taste. I used to like wearing BDU pants at the range, because they have lots of pockets and allow greater freedom of movement than jeans while still being sturdy enough for kneeling, laying down, walking in brush, etc., but these days they've become a hallmark of the poseur "Mall-ninja" crowd.
Also, big dark trenchcoats are a sure sign of movie-hero wannabes, as they serve no practical purpose at the range unless you're shooting in a sandstorm or monsoon.....although i DID used to have a trenchcoat i kept in the car that i occasionally used as a shooting blanket for shooting prone.
More important to watch for is large groups of people the same age, groups with video cameras in conjunction with military-style guns, or any utterance of the phrase, "Hey, watch THIS..."