You really do have the license during fashion week to wear the things that you wouldn't necessarily wear to dinner, because it really is a fashion parade.
Everyone needs to have a denim shirt in your wardrobe. They work in the evening with a blazer or over your shoulder. They're great to pair with a pair of shorts - roll up the sleeves, unbutton it to show a peekaboo of your tank top.
Sometimes when I'm being photographed, I hear the voice of this photographer who told me when I was about six while he was taking my school photo that I didn't have a nice smile, and I shouldn't smile in photos.