If you created the drapes using marvelous designer you should not need to uv them, as md should have created the uv as well as the geo. Uving such a high Polly object is never easy one of the reasons I use md is because you should not have to.
Put a checked map on the drapes you should see it's square and even if not post an image of what it looks like and I'll be better able to help. Will have to wait till tomorrow though I'm just about to hit the sack
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"