This industry comprises establishments primarily engaged in one of the following: (1) knitting underwear, outerwear, and/or nightwear; (2) knitting fabric and manufacturing underwear, outerwear, and/or nightwear; or (3) knitting, manufacturing, and finishing knit underwear, outerwear, and/or nightwear. Cross-References. Establishments primarily engaged in-- ? Manufacturing outerwear, 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 Industry 31331, Textile and Fabric Finishing Mills.