This U.S. industry comprises establishments primarily engaged in one of the following: (1) knitting underwear and nightwear; (2) knitting fabric and manufacturing underwear and nightwear; or (3) knitting, manufacturing, and finishing knit underwear and nightwear. Examples of products produced in underwear and nightwear knitting mills are briefs, underwear T-shirts, pajamas, nightshirts, foundation garments, and panties. Cross-References. Establishments primarily engaged in-- ? Manufacturing underwear and nightwear from purchased fabric--are classified in Industry Group 3152, Cut and Sew Apparel Manufacturing; and ? Finishing apparel products only--are classified in U.S. Industry 313312, Textile and Fabric Finishing (except Broadwoven Fabric) Mills.