The answer, it would seem, depends on who you ask. Some people (as we may see later in the comments to the right) have very strong opinions on how one should tie one's scarf. But we've always had pretty egalitarian views on clothing, so we switch up the knots depending on the occasion and the outfit. The key is finding a knot that works with what you're wearing, sort of like a tie. If you've got a suit and topcoat on, you probably don't want to go with the loose loop.