I've been hiking and running in skirts for 15 years, including our AT thruhike, our Tahoe Rim Trail hike, our Long Trail thruhike, and our Camino de Santiago pilgrimage. If it's cold and rainy, I just wear synthetic long johns. For the winter I even have a down skirt. They're simply more comfortable than pants...and more hygienic. My skirts of choice are mostly microfiber...light, quick drying, and durable, though I have some cotton/poly blend skirts that work well in the desert where I live. I wore a wrap style on the Appalachian trail, but a longer, more conservative style for our Camino.