It's not about the environment, despite your rather rude italics. I just think Park Aves look too dressy to be worn without a jacket. Personally, I save captoe bals without broguing, in dark brown and black, for suits. Your mileage may vary. If "t's not about the environment," then why did you attempt to clarify your initial statement ("I would not choose the Park Ave for either khakis or odd trousers") by adding this: Bear in mind that he mentioned "business casual," which often includes neither coat nor tie. For that purpose, I would not suggest the Park Ave, even in brown. You seem kind of sensitive about my use of italics. Shall we meet at the O.K. Corral tomorrow, at dawn?