Butterick 5778, c. 1950s, Maternity Jumper or Scallop-Trimmed Dress. (A)This is a lovely sleeveless dress with very flattering scallop-edged neckline and a graceful skirt that has a special adjustable features with gives a pocket semblance. (B) U-necked jumper, too, has this waist adjustment. Found in the July 1951 Butterick Fashion News