dmdrewitt:
I don't think trainers and jeans are appropriate for the CAA
The man/woman is there to have a medical.. I would certainly hope that these people are professional enough to do a proper medical examination without you dressing up.
I would suggest trousers and well polished shoes. (this gives a good impression to the doctors and nurses).
My medical has always been issued on the basis of my medical state, not the way I was dressed when I walked through the door..
Regs