While doing volunteer work in NYC, Emma Stone wore an ensemble that perfected the fine line between dressy and casual. She started out with this adorable Burberry dog-print t-shirt ($337) and high-rise Rag & Bone jeans ($176), then added on a navy peplum Preen Line jacket, which took the look to fancier heights. Cat-eye sunglasses and cap-toe Chanel flats added further polish to her outfit. Next time you need to dress up your jeans and flats, throw on a peplum jacket just like Emma did. You can even pair your peplum jacket with a black sheath dress for the office, then leather shorts for weekend fun.