Where a character has their finger hooked into a waistband:
post #560151 post #563982 post #490601 post #438220 post #561370 post #559819
Sometimes, but not always (as seen in the thumbnails), they're in the process of stripping. Should there be a tag? Do we already have a tag? If not, what should it be?
I've got underwear/waistband_hooking/pulling/tugging as possibilities. Mind it can happens with pants too: post #556544
Updated