This picture shows a young lady in 1958 modelling the new short! skirt.
By the late fifties skirts started to get shorter as young women found the long tight skirts of the mid fifties were
too limiting for their active life styles.
The high step pose is meant to demonstrate the improved freedom of movement that the shorter straight skirts gave women.
Note the 3" stiletto heel court shoes which were very popular at the time.
http://65.160.96.70/hhplace/images/1057015953