Not naming the clothing has certainly caused confusion on eBay. There have been auctions where a seller thought Hermione's trousers were her jacket or her sweater was a scarf.
I'm surprised that different items of clothing would be used for one card. Unless...Roz, do you think it's possible that the black and grey swatches are meant to be SEPARATE cards, each with a print run of 834, instead of one card of 834 with two variants? Except that the picture is the same on both cards.

Well, I've just sent off my third email to Artbox about this card, to answer this question. If they don't get fed up with me, maybe I'll have a reply to post tomorrow.