From years of golf and cycling, I have the typical tan lines brought on by those clothing choices. I just buy a short or long sleeved top to hide the arm tan, and some stockings to hide the just above the knee tan line. It seems to work.
Having spent the last half of 2019 being diagnosed with, having treatment for, and recovering from skin cancer, what my tan lines look like is the least of my worries.
I feel that a lot of crossdressing is hiding what is underneath, so it's just another step that I have to take to achieve my desired look.