McQueen was a natty dresser, but a lot of dudes who try to dress like him end up looking like they're trying to dress like Steve McQueen.
Very true. It also helps his cause that the costumes (and they were costumes, as he was after all acting in films) that he wore like shawl collar sweaters and corduroy jackets are right in fashion now.
I say this to take nothing away from Steve McQueen, as I have always been a fan of his work as an actor, but lately he has become the a style icon due to his particular place in acting history. I feel he often did not get his due as an actor, and is associated with a specific time period, because he did not die young (like James Dean) and become some sort of icon, or live to a ripe old age (like Paul Newman) and have a broad body or work, but was stuck somewhere in between.