It's April 6th, which means ... it's Tartan Day! Yep, today is the official day to celebrate the delightful plaid pattern known as tartan. In order to avoid a lengthy etymological discussion of "tartan," for now we'll define it as a colorful plaid with lines and squares of varied thickness. It's a classic pattern that's a little preppy and a little punk rock. Want to celebrate this random holiday by bringing some tartan into your wardrobe? Here are 10 stylish ways to do it...