I looked in the previous thread and didn't see anything mentioned about this, so I thought I would add it here. In Sept 09, Sotheby's held an auction of clothing and memorbilia. (The estate didn't sell it--a friend did.) Half of the proceeds from the auction went to the Audrey Hepburn Children's Fund and UNICEF. Her are some pics.
The majority of the pieces are by Givenchy and were wore in her films.
If the Valentino lace and cream dress looks familiar, it's because it's the dress that Jackie Kennedy wore when she married Ari Onassis.
The wedding dress might not look familiar because Audrey never married or filmed a movie in it. She was supposed to marry James Hanson, but called off the wedding and gave the gown away.
Credit to guardian.co.uk for pics.