An
expression used when talking about a
girl who has
dyed her hair
If it's not directly obvious the phrase comes from the wearing of a coat with furry collar and cuffs, the indication being that the collar and cuffs don't match in colour in much the same way as the hair on her head doesn't match the hair on her genitals.
Commonly used in sentences such as "Nice tits, pity she's not collar and cuffs"