The wardrobe rack of costumes worn by Betty Grable and Alice Faye also contains Gale Gordon's silver space suit from Lucy and the Generation Gap (1969). It is hard to imagine Grable or Faye wearing that.
One mannequin on the 'soundstage' doesn't get identified. It is dressed in Roman armor. It may possibly represent Charlton Heston in Ben-Hur (1959), but was cut for time.