I'm a long sleeves and hat kind of guy too, but be careful of not wearing sunscreen. You can still burn if you're out in the sun all day, which one might well have to do in a survival situation.

Don't even think about not wearing screen on a sunny day when the surface is reflective (water, snow, white soil or sand, etc.). Besides, modern sunscreens have come a long way. There are a lot of non-greasy ones out there that absorb into the skin. I use Banana Boat brand.