From article: "Boxer shorts in color were a new trend although slow to catch on. Popular colors were blue, mauve, and peach in silk or cotton. In 1929 clothing companies introduced rubber in the waist band of loose undershorts rather than a tie string. At the same time they also introduced a fly that opened to the side"
Knitted Silk Drawers with ties at waist and legs. Around 1806, drawers, mainly made from cotton or linen, began to come into fashion as an imitation of men's undergarments. Young girls wore long, lacy pantalettes which showed between their skirts and ankles. Women wore drawers, generally with a split crotch to make it easier to visit the withdrawing room. suzilove.com