What is "underalls"

Underalls was a brand of undergarments for women manufactured by the Hanes hosiery and underwear company of North Carolina and marketed in the United States, Canada, and Mexico from the introduction of the product in 1976 until the halt of production in the early 1990s. The product was noted for being a combination of pantyhose and panties together, presumably to prevent panty lines. These also had different trademarked variations, such as Slenderalls, Coloralls, Summeralls, and Winteralls.