Have a wash (soap and water works quite well) and stay away from synthetics materials especially old or heavily used (even though washed and clean before use) base layers. X-static or merino wool base layer would be useful. Soap will also vary in its ability to reduce bacteria. i.e. Bog Myrtle or medicated Tea Tree oil soap will perform better and can be useful at keeping the flies off as well. I prefer the smell of Bog Myrtle over the Tea Tree though.

A small aerosol deodorant (travel size) will also double up as an emergency fire lighter.