Sensory processing disorder?

I'm concerned my daughter my have a sensory processing problem. She is 11 years old and refuses to where underwear. She will only wear certain types of clothing. She was a pretty typical child until she was about 4 when this started. She will wear bathing suits, but not under clothes. I have gotten her to wear underwear for brief times throughout the years. Whenever she wears them she has an obsessive compulsive urge to pick. I have tried everything I can think of. Reward system, punishment. I don't know what to do. Anyone have experience with this. She is growing up and I'm worried for when she starts her period.