Young Blonde Girl Wearing White Jean Skirt On A Sandy Slope

In the sixties, hippies first came up with the idea of recycling old denim pants or jeans into long denim skirts, by opening the inseams, and inserting pieces of triangular denim (or any other fabric) in the front and, unless a tall slit in back is preferred, also in the back of the opened-up trousers.
Styles of jean skirt
The classic style of a jean skirt resembles a common pair of jeans, with a front fly, a fitted waist, belt loops, and pockets. There have been a large number of other styles constructed over time to resemble other types of skirts.