Perhaps the dress belonged to his first wife, Mimi Rogers.
If you google images of her you'll see what I mean (first results nsfw)
(
kinks rock over London, rock on Chicago,
Tue 13 Nov 2007, 18:56,
archived)
crikey
she's not shy, is she?
(
emvee cruor deo cruoris,
Tue 13 Nov 2007, 19:04,
archived)