I didn't see the episode, and I'm not sure of the exact cut and style. I have more unfortunate news: simply Googling "mens velvet/plush jacket plum/purple/violet" doesn't yield a whole lot of colors other than charcoal and black. Even a search for the specific item in TLC's WNTW wardrobe has yielded nil.
I hope the other folks on this forum can be of more help.
If you are talking about the outfit that Clinton is wearing in the show's opening scene (repeated every week) then that was filmed years ago and I doubt those styles would still be available. Season 8 is to begin in January of 2010.