I run hot. Combine that with hot weather and I sweat a lot while backpacking; even in snow and cooler temps actually. So I bring something I can switch out when I get to camp. In snow; 2 layers. Under the regular conditions I only need 1 layer because I am wearing 1 layer. The cool thing about desert camping is that you can put your wet shirt out at night and in the morning it is usually dry even though its cold outside. Switch back and you are ready for the next leg. Anyway, that's what I do. I switch out socks every day, rinse the old pair out (if I have the water) and dry them on trail.

Hygiene on trail...what's that? Brushing your teeth and not touching the # 2 you left behind? You can carry these antibacterial liquids with you to help with this. They are small and easy to carry. Otherwise I just wash up every day I can. Sometimes I have to skip a few days due to lack of water. You can bring something specifically to clean your face at the end of the day as well.

sK