Socialites keep track of which gown they wore to which gala to avoid wearing the same dress for the same crowd twice and for future fashion archivists to pore over when they donate the contents of their wardrobes to a museum.

But even if the paparazzi aren’t likely to swarm you on the street, and the only institution likely to be interested in your wardrobe after you pass on is the Salvation Army, it can still be useful to keep a wardrobe diary—especially if you tend to have items languishing at the back of your closet that you forget about.