The slit is pretty high up. I could move around though and it didn’t ride up. I was wearing a 4” wedge and the inside solid liner was just up off the floor and the outside lace liner was still touching the floor.
The outside is sequins so yea it’s a little rough, but the inside against the skin is not.
I’m 5’3”, 128lb, 34D, Athletic build, ordered a US6.