Wikipedia says: "The Jerk is similar to The Monkey. The arms move and hands move as if conducting a band. The wrists cross in front of the chest and then sweep out in time, or at half time with the music. The hands are up at face level. On count 1, the outward sweep, the hands are quickly pushed out, giving the jerky motion. For a little more style, the fingers are snapped on the two outward movements — the first and third counts of the hand motion."
None of this seems to preclude cape wearing, but it should be noted that the Wikipedia entiry "is missing citations or needs footnotes."
This was during a phase of Josie's pre-Pussycat career when she had the physique of an ironing board.