Key ring on belt loop for my season pass. But never have to show it as all the lifties know me(except on race night when I am in my GS suit with no pass after the run(pass is on the pants at top of run.)
At other resorts I use a key ring on a pant zipper for easy access, or a rfid around my neck.
I use to always do the arm band just above the knee. Never had to worry about it sliding.