Young Girl In Shorts

Three quarter pants (Or Flood Pants)
A name used to refer to pants such as Shants or Shankles which go down to the calf and are arguably not long shorts but short longs.
Zip-off Shorts or Convertible Shorts
A pair of long pants that zip off at the knee, allowing the wearer to change from pants to shorts as the weather changes. Originally a hiking garment, these have become a more casual fashion item since the late 1990s.