God bless the Washington Post. Always asking the tough questions. Following the annual Scottish Christmas Walk through Old Town Alexandria, where many Scottish men wear kilts – the Washington Post wanted to know, what exactly do you wear under those kilts? Boxers, briefs, or do you go commando? Tradition is never to wear anything underneath your kilt – so how do area Scotsmen dress? Well if you really want to know, one parader said “A…