From Butterick:
Straight legged proportioned pants in three height variations have elasticized waistline and stitched creases.
Recommended Fabrics: Soft or Crisp fabrics such as Double Knit, Chino, Broadcloth, Tweed, Twill, Poplin, Denim, Gabardine and Wool Flannel.
Sizes: (8-10-12), (12-14-16), (16-18-20)