What was the BEST fashion-trend you have ever worn?

We have all been through the hilarious fashion trends that we would never want to wear again....super-wide-leg pants (70s?), the Jackie-O hats, tight-rolled skinny jeans, big Cindy-Crawford hair, the Debbie-Gibson-side-ponytail, big curled frizzy bangs, the M.C. Hammer parachute pants, and so on. But what about the BEST trends you've ever worn? What would you like to see cycle back again? What are the "keepers" in YOUR closet?