A friend of mine used to once a year hang all his shirts with the open end of the cloth hangers' hooks facing forward. After wearing and washing them he'd hang them back with the hanger facing the other way. After a year he'd toss out any shirts that were still facing the original way and had thus not been worn.
I’ve gotten rid of a lot of clothing in the past 18 months. I bring a very limited amount of specific clothing around the house, local hikes, the theater now and then etc. I just have no use for a lot of the to the office clothing I wore into the office every day.