As far as I’m aware, I’ve never had any transfer onto my clothes, and I used to wear white shirts due to work. I only usually rest my elbow on the armrest too, so I think you’ll be fine.
The instructions state that you should wait at least 24hrs after applying it so it has time to soak in etc. I gave it a final buff the following day, and had no residual dye left on the cloth.
Do note, that certain cleaning products (predominantly high strength detergents) can sometimes agitate the dye, so if your giving your car a thorough clean, try and stay away from any high strength cleaners (at least on the dyed areas). Although I doubt you’d want to clean leather with that kind of stuff anyway lol. Water and other mild leather cleaning products don’t seem to remove it though
