I have been tracking everything I wear since January. It took at least 3 or 4 months to truly catalog every item I own. Especially since I have 4 seasons where I live.
I currently have 41 items on hold. The bulk of these are: duplicate purchases (apparently I was stocking up on layering basics for a while and they were taking over my shelves) and impulse purchases. When I can't find something in my closet to wear, I run out and purchase something new instead of creating an outfit. One problem with having lots of clothing, you don't wear all of it. And many items that you may have liked at one point, fall out of favor as your tastes change. And you are "stuck" with them. I have been purging and putting items on hold every month. It's been a slow process but the last YLF swap helped a lot. My new purchases, have been much more carefully selected choices. And I spend more time now trying to create outfits with what I have, keep a list of items I want, and try to purchase items that only "fit" with my current needs and desires for my wardrobe. It's been a learning process and a LOT of returning along the way. But in the end I hope my wardrobe will be streamlined and full of only items I love and wear.