Aside from gear I have about 100 pieces at a time in my closet and there are about 5 that have not been worn in the last 21 months. This is mostly because they are dressy but there are a couple that I am just not into for one reason or another, but that I keep.
I have another 20 or so pieces that are really lightly worn - 1-3 wears in a year, and at the top end, about 50 that have been worn 15 or more times in a year. To me, that's once a month or more and those are my true core pieces.
I don't edit out the least worn ones though unless I don't like them or there is a fit issue - I have a few beloved pieces that might get 1-3 wears a year and be just the thing for a few occasions. Some of these are new pieces too that just haven't had a chance to be worn.
I do have a few pairs of heels that I might put up for evaluation. I like them all - don't want to buy more - and think they are all worth keeping. But interested in others views.