See Skirtarianism

"....wearing skirts and dresses exclusively, shunning pants, shorts, and other such bifurcated clothing....."

In a broader sense, a "skirtarian" is anyone who does this for any reason whatsoever, just as a "vegetarian" may have any of a vast number of possible reasons for not eating meat. Therefore includes a female "skirtist." (see skirtism)

When you eat dirt for the first time and leave your family to build a shack in the woods