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:
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.
Which do you prefer?
Well, as long as the collar and cuffs match...