Such a good wedding-guest dress — a Reformation Floria slip in the prettiest olive green floral, with a halter tie neck and an open back that make it feel special without trying too hard. It's a bias-cut midi that skims and moves beautifully. I'd wear it with strappy heels and gold jewelry for a wedding or a summer evening out, or dress it down with flat sandals on vacation.

Buy for $90 or Rent for $35/week. Original retail price: $178, 80% off retail.