You too had to deal with Urethane against Urethane stickiness (a clear sign of TB accessory addiction but... I'll take the 5th on that)
As far as the nanobot fabric is concerned, all one has to do is get in touch with cuttlefish, behavior researchers and pick their brains about chromatophores. (little cells that turn on and off inside the skin thus controling the color of the animal)
I sooo want this assignment!
Now, the trick is keeping the fabric strong but the upper layer flexible as in able to change color.
I seem to remember that there is some kind of fabric that changes color with the heat of the wearer so a very business like Black or Steel daytime bag could become a hot Red, Plum or Indigo in the club.
But what about the ones who don't go clubbing but get really into books or yarn, would it turn color at the library, bookstore, yarn shop, craft fair and the like?
Would it be "Red Alert, Mr Worf" or nerd alert everybody!