I have a similar problem because of some meds I have to take, plus a number of "sun-related lesions" showing up in my 60s after decades of spurning sunscreen (lesson to you young guys there...). My daughter used to work at a local outdoor-equipment place, and she scored me a couple of long-sleeved shirts rated SPF 50. Several companies make them. Mine are North Face (employee discount price) and Columbia (somewhat cheaper). I don't burn or tan at all through those. You don't completely escape the Bedouin look, but they're reasonably attractive casual shirts.
I don't do anything special for my legs other than sunscreen, which works all right for me. When I started watching the sun, though, I googled up several places that sell loose, airy pants with room to move and SPF 50 protection. I sometimes ride in a pair of nylon zip-off "convertible" pants from REI that aren't much for sun protection but presumably feel the same way SPF-rated pants would feel. Takes a few minutes to get used to them (I'm a year-round shorts guy by choice), but they're fine once you do.