how do the coach collars fit?

  1. i wanted a black patent collar for my westie, before i was worried it would rub off on him, but my other thread i was assured it wouldnt cause its patent, but they dont have the collar in medium black, so im wondering how the fit is for the collar? he'll he wearing a harness when hes outside, so the collar is more for looks and to carry his ID tags. should i opt for the small or the large?