Buckles/belt layout are gacha AF
Invoke with b3lt, 1.1 or 1.0 strength. I would always include (buckles) as well. as that's the name of the game.
After that, this has some success applying to anywhere a "belt" would be, if you invoke that object. You can use belt, but that will just make a belt appear.
Corset
Vest (I would invoke [corset] ) to help it out
Gag ((gag, gagged)) - sorta works
Collar
Thigh Strap
Armor (breastplate pauldrons gauntlets etc) (effect can be subtle)
Cuffs/
etc
Belts/Buckles get stupider the farther out you zoom so keep that in mind.