I gotta agree with Jay; when I first saw the black leather UK, the first thought through my mind was "fetish wear." That's not to say I'm not tempted by any leather kilt, but the smooth leather, the narrow apron (almost reminiscent of a loin-cloth) and lacing up the sides of the UK did make a certain impression on me.

I do like the "loin-cloth" impression of the cloth UKs - gives it kind of a "tough" appearance, but adding the leather component seems to put it over the top for me. For me, the extreme of going with leather needs to be moderated with a more traditional style, like the TFCK, or a less finished surface, like suede (or both).