I always joke that my friend Susan Cernek is the nicest person in fashion. She has a mouthful of a title at Glamour, but she always looks drop-dead gorgeous and friendly, with a megawatt smile and easy laugh. So, I asked her to share her summer uniform with us (in hopes that we could copy ruthlessly:).Here's Susan's take:Here, my husband Rob and I are on grill duty at our dear friend's house in