There's a girl I know who was extremely sensitive to textures and touch as a younger child. She wore only the softest of shirts, handed down from her older brother. All tags had to be cut out of anything she wore. Her preferred state of dress was one of undress. It wasn't only just clothes which could rub her the wrong way. Anything -- and anyone -- touching her could have an impact.
She is who I thought of when the One Single Impression prompt appeared.