It's interesting, I think I've got two answer for this.
If we're talking about textures I like on clothing, it's cotton, by far. Fleece and some synthetics are fine for a while, but please don't make me war them for days on end. Absolutely no to wool and things that can be outright scratchy. Tags on clothing, depending on what they're made of and where they are, can be awful.
But I really like touching the scratchy side of velcro to my lips. So if it's actually as a stim, I like textures that are rough to my lips. Same with metal things - I like the feel of them on my lips.
_________________
Level 1 Autism Spectrum Disorder / Asperger's Syndrome.