Hey friend! <3 I’m always happy to help with stuff like this. Most of the time all my purchases are logged in my Plus Sized Clothes tag. These particularly leggings came from Old Navy. Right now they have plus sized print leggings on sale, here. For the record, I’m a size US 18, and I usually buy the 2x. I have a pair of 1x and they fit okay, but I have pretty thick calves and ankles, and sometimes they are just too tight there.
I also regularly get printed leggings from Modcloth, though I usually size up and get a 3X there, since their sizing is wildly unpredictable.
If any of the rest of you know where to get tights or leggings for plus sized folks, let me know!