Unusual Vintage Undergarment, Menstruation Panties, 1900s to 1920s, Cotton Muslin, home sewn

ERA: True vintage item from the early 1900s to 1920s
MEASUREMENTS: laying flat it is 32 inches wide x 28 inches long. Would fit up to maybe a 28 inch waist, depending on how you secure it.
MATERIAL: cotton
LABEL: none, appears to be home sewn
CLEANING: hand washed
Off white cotton muslin home sewn custom undergarment. There are no hooks or snaps on it, so it must have been pinned when you wear it. Wraps around the waist and narrow piece between the legs. Double layer of fabric. It appears to be something a women made for menstruation maybe. The garment would be pinned to wear and hold a handmade fabric pad.
CONDITION: Very good condition. Light pink spot, faint watermark line. Some fraying on threads along the edges.