Tom Ford for Gucci subtly sexy ivory silk knit tank which is all business (well, perhaps under a blazer) in front, all party in back. The front is a lowish V neck; the keyhole in the rear features a clever twist detail low down at the small of the back. It's size M but fits fairly snugly and obviously does not accommodate a bra, so busty creatures are not advised to go there. 

STORY: I bought just about every piece from every collection Tom Ford did for Gucci and YSL. A couple of years ago I got a call from the Tom Ford people. "We hear you have an amazing collection of Tom's pieces," they said. "Would you consider parting with them?" Well, I thought, maybe now that I'm a startup entrepreneur not raking in a massive salary...  "Sure," I said. "How much are you offering?" "Oh, no money. We thought you could donate it to our archive." So I told them no thanks. And here they are.