To be more specific, something you have bought that has stood the test of time and fashion.
For me it was Ralph Lauren's classic navy wool jacket with his gold and red emblem on the pocket. It cost a small fortune but for over 5 years I can throw that over a pair of jeans or a skirt and always feel like a million dollars.
I also have a jacket by Dana Buchman with a matching sweater that is gorgeous and never fails to make me feel good.
What was your best purchase?