From Folkwear:
Misses 8-18.
Bring out the cowgirl in you! Equestrian women of the early 20th century, who were determined to ride astride rather than sidesaddle, wore these divided skirts. An ingenious fashion, with front panel that buttons one way for a skirt and the other way for pants. Pattern is derived from a skirt worn by legendary rancher and rodeo rider, Fannie Sperry Steele.
Suggested fabrics: Medium to heavyweight cottons and blends such as poplin, denim, gabardine, corduroy; linen; light to medium-weight wools; suiting weight silks.