"This is a great opportunity to get some cool (and rare) Britney items while contributing to a very important cause!" says a posting on Spears' Web site. The 23-year-old pop singer was raised in Kentwood, La.
Items include a white stone bra worn in one of her videos, a pair of blue-and-pink jeans with a pink suede buckle belt, and an autographed "I Have the Golden Ticket" burgundy tank top with an arrow pointing down.
The tank top is similar to the light blue top a pregnant Spears wore to the premiere of "Charlie and the Chocolate Factory."
The auction, which opened Saturday, continues this week, with proceeds going to The Britney Spears Foundation to help hurricane victims.
Spears, who is married to her former backup dancer Kevin Federline, gave birth to the couple's first child, a son, last month.