Where are these socks???

The socks in the first picture are apparently part of the gacha, and I’m 90% sure I got them from the gacha (I was doing single tickets too fast and I didn’t realize, but I didn’t have those before) But when I look at the gacha list it’s not there (it’s not in the 3 or 5 star either, but I just added a picture of the 4 star since they’re 4 stars)