From Vogue Patterns:
Vintage Vogue Patterns 1959 One Piece Slack Suit and Skirt. Slacks in two lengths join the fitted bodice at the waistline. Zipper front closing below the notched collar. Below elbow length sleeves may be rolled back for cuffs and sleeveless. All around gathered skirt, in two lengths, separates at front. Authentic Vintage Reproduction includes additional size options and cutting layouts.
Recommended Fabrics: Corduroy, Cotton Satin, Cotton Twill, Denim, lightweight Wools, Linen, Pique, Shantung, Surah, Twill, Velveteen, Wool Jersey. Interfacing: Lawn or Muslin.
Sizes: (8-10-12-14-16), (18-20-22-24-26)