My fall wardrobe could use the helping hand of a sleeveless knit tunic. For starters, it's so right-this-minute looking, plus it's fantastically versatile: it can be worn over dresses or with a pair of jeans and a blouse. I'd also try it without anything underneath and team it with a midi skirt. The one above by Pixie Market is pretty perfect. I also like these from Theory, Vince, Whistles, Warehouse, Isabel Marant, and ASTR.