From the NannyMUD documentation
2001-01-02
unwear_hook - Unwear hook
/obj/living_functions
Any object can use hooks.
unwear_hook
unwear_hook is called from silent_stop_wearing() just before the armour is removed.
wear_hook in hooks/wear_hook
NAME
unwear_hook - Unwear hookSYNTAX
void unwear_hook(mixed arr, object living)DESCRIPTION
unwear_hook is called from silent_stop_wearing() just before the armour is removed. The arguments to the hook are as follows: ({The armour type, The object being worn}) The living doing the removing