I do this all the time with animals (here of Kofk, of course) I buy all the pets I can but then I leave them in the wardrobe and "wear" just my Cheshire Cat
In fact, the only reason why I have the snake right now is that the cat is not compatible with my current hairstyle

I buy items in kofk just for collecting them. Doesn't matter if I wear them or not.

I often do this in RL. I have an entire wardrobe full of summer dresses I never wear. I love them, but we've got like three days of summer every year, and I usually have to work on them, so then I'm wearing my uniform. Still I keep on buying them because I love them

Another silly habit of me is buying traditional clothing when I'm abroad. Traditional clothing is often quite pricey, but it's just so pretty! Like, I spent 100 euros on a Japanese yukata (it was on sale, I was so lucky!), 350 euros on a South Korean hanbok, and 150 euros on a Moroccan kaftan. Those are my price possessions, and I know I'll never wear them. I wore the yukata to a wedding once, but it got so dirty that I don't dare to do it again. Especially with the hanbok for example, because it's so much more fragile... And still, I'm buying an actual kimono next time I'm in Japan. I won't quit this spree, never.

As for KofK items by the way: what Lliikkiittaa says.

All the time. If I would use every item I own, I would have to change my avi at least twice a week. In reality I only change it a few times a year.
So I think about 95% of my item's have never even been used.
I'm a hoarder/collector/dragon. :}