Since when is this a "fashion" forum? I thought it was about kilts? If "we" want the kilt to become acceptable throughout society, we have to allow people to wear it (properly, i.e. not back to front) as they wish; not just in the traditional way. With a formal tux with tails (hence low three-button vest), a European tie (shorter than regular men's tie) is quite acceptable. You don't want the tie to be hanging lower than your vest (waistcoat). That's just my tuppence.