Noticed that people have asked for this all the way back to 2007, but hope springs eternal I suppose.
It would be very nice to have some sort of dressing room/item preview function, especially for armors. This would make it much easier to choose between otherwise identical items on the pawnbrokers or AH.
This may be made more topical now that there are purchasable hair dyes... using one, then buying some great new armor that looks *terrible* with it is more than a bit of a letdown. It's also very surprising to not have this function, when you look at how many competitors do.
Cheers.
*Edit* Please accept my apologies if this double-posts. Got a blank white page on submit, don't see it posted when I check the forums in another tab.