If there's only one Columbus Day Sale you shop this weekend, let it be the one at Calvin Klein . This is your chance to save huge on this designer's red-hot fashions. Because right now, sweaters and outerwear are all 40% off, while shoes and men's underwear save 25% off. Shop soon, because we predict that the merchandise will be flying off the shelves and you'll want to get in on the deals before that happens. Sales end 10/10/2011 and 10/16/2011 respectively.