Do you buy a gift for prom?

Have you ever considered purchasing a gift for your prom partner or date? It's a special occasion, and showing your appreciation through a thoughtful gift can certainly add to the experience. Do you believe in the tradition of exchanging gifts for prom, or do you think it's an unnecessary expense? Perhaps you have a unique idea for a non-material gift that could make a lasting impression. What factors do you consider when deciding whether or not to buy a gift for prom?