Gen, I have the same fetish! I wear nylon pajamas every night and if it’s cool in the house they definitely firm up instantly! I am amazed at just how sensitive they are to the touch, be it from me or my PJ’s. Even my wife notices their quick response to the least little stimulation. They are definitely my first physical turn on point.
Sorry I went from the topic at hand but your answer really struck a nerve (nipple) with me.