I'd add onto what Suz said about cutting the tags and what Liz said about having a 'perfect' skirt and not wearing it because there is one more piece for me I'm trying to get my head around.
Sometimes I'm subconsciously 'saving' it. I don't want to cut the tags in case I 'might' take it back, even if I love it, but I also don't want to wear it where I will a) sweat in it, b) possibly get food on it, c) get cat fuzz/claws on it. So for example dropping boxes off at UPS today -- my outfit looked great with a new blazer, the temperature was perfect, but I was afraid I'd catch the buttons on the box edge or something lugging cardboard around, so I put it back on the hanger. This wasn't an expensive blazer either, and I'll do the same thing with a graphic t shirt.
So sometimes I need to give myself permission, but also recognize, even if an item of clothing is great for me, I just don't have to have it and therefore will opt to wear older clothes out instead. I'm trying to find where on the minimalist closet vs. enjoy variety spectrum I fall to try to figure this out. I'm also trying to figure out how RATE vs. polished works for me. It's all a little in flux, and what I really need to be doing right now I think is tracking wears.