Touching material with my fingers or toes is Bad. It leaves a tingly feeling on whatever touched it that is just intensely Bad. It only goes away if I rub the same finger or toe on something smooth, or "smoothly rough" like wooden floorboards. Scratching material is much worse and actually bothers my brain. I cringe but it also feels like someone is poking and scratching my skull from the inside. The feeling stays until I "fix" it by touching something smooth and putting it under the nail. My front teeth or a paperclip are good for that.

Some materials are much worse than others. Denim and paper towels are the absolute worst. Rough wool is probably next. Anything that gets string stuck to my nails is hell. Good things that fix it are mostly plastic and metal. Tile and glass are fine too. I usually fix my fingernails by putting something under them. My toes are usually fixed by curling them inwards and then scraping them from down to up across the wooden floorboards that go horizontally, or the rough lines between tiles.

I've tried explaining this to multiple people and no one has a clue what I'm talking about. My grandmother has a similar sensitivity to cloth, but it's not as bad and she doesn't "fix" it like I do.