When it comes to casual clothes, Kate Middleton is known to have an affinity for J Brand jeans. Her latest pair, which she wore to the 2012 Olympics in London with a matching Smythe blazer and a striped top, are a closet staple. These J Brand midrise skinny leg navy cropped jeans ($169) are a must have for various reasons. First, their stretchy nature makes them comfortable and easy to move around in. The navy color gives them a sophisticated spin, meaning you can dress them up for night or for the office. The midrise waist will suck your tummy in, and the cropped hem means you can show off all your fabulous shoes, even those with ankle straps. And of course, the princess has them so you can just call them your Kate Middletons. Wear them with cork wedges like Kate — here are her Stuart Weitzmans in denim ($189, originally $375) — or flat sandals for a more laid-back approach.