Instead of removing the piece of apparel from the preview, it puts it on the lowest possible layer.
Picture with full outfit on:
Picture with Beloathed Basket off:
Picture with all pieces taken off:
It does still save correctly, as I refreshed after removing the basket and adding new apparel and the basket disappeared, but the preview is incorrect while changing in the wardrobe screen.
[e]
It only removes the removed apparel if you save over it (which isn't always ideal). Here, I've taken off both the background and the tree, but they're still showing, so I'd have to remove them both and save to see what my wolf would look like without them.