Unforsequins
Tacky clothing decoration (i.e. sequins, beads) that goes unseen when the apparel is hanging between other items on the rack, causing anguish when a customer removes the item from the rack and discovers the ruination of an otherwise purchasable textile.
I thought I had found the perfect blouse, but I pulled it off the rack only to discover that unforsequins covered it in a sash-like spray from shoulder to waist. There was no way I could buy it.