My friend Evan has this Bob Mackie dress at his vintage store Frock.
If you’re into Mr. Blackwell, there’s another interesting piece on eBay: a cream dress with a matching sleeveless jacket and a brightly colored scarf. It’s in pretty good condition for $55.
UPDATED TO ADD: After reading this post, gorgeous blogger Cherie of Shrimpton Couture decided to share her spectacular Mr. Blackwell gown with us. Click the photo to go to her blog for more information.