You have good reasons to avoid the dressing room — long lines and fluorescent lighting among them — so skip it altogether by "sizing yourself up first at home," says designer Cynthia Rowley. Note how your favorite clothes look when you hold them to your body, and recall that when you're shopping. If the fabric of a pair of jeans or a skirt doesn't exactly meet the edge of your waistline when you hold it up, it won't fit correctly, Leah Feldon says. And the next time you're in a hurry at the department store, remember this measurement trick from Rowley: The distance from the side of your neck to the tip of your fingers (on an outstretched arm) is about the same length as your inseam.