Actually, this one comes from menswear. From the early nineteenth century until after World War II, men widely wore highly starched, detachable collars and, to a lesser extent, detachable cuffs. It was initially a practical decision--why wash the whole shirt when only the neck and hands get dirty? Of course, nothing says "I have enough money to afford laundering, and thus have social standing" like a four-inch gleaming white collar amid sooty Victorian England. To this day, shirts with a colored or patterned body and solid white collar (and often a matching French cuff) are moderately popular.

James Bond fans will recall this exchange from Diamonds are Forever:

Bond: Weren't you a blonde when I came in?
Tiffany Case: Could be.
Bond: I tend to notice little things like that - whether a girl is a blonde or a brunette.
Tiffany Case: Which do you prefer?
Bond: Well, as long as the collar and cuffs match...