I almost returned this slip as the photo shows an ankle length slip and a just below knee length slip arrived (I am 5'8".  So I ordered the 38" slip and now have both lengths.

Note to younger women who didn't grow up wearing slips:  a slip not only keeps a skirt from being see-through, it prevents it from going between the legs while walking, so it's good for walking in a long skirt, also more modest.