This is not a sash, they are ribbon work panels. These type of ribbon work panels would have been worn with straight dance clothing at a dance. Ribbon work panels are also used in making a blanket. If these panels are Osage, it'd be intended for a man to wear. This is indicative by the geometric designs.

Tags: green, ribbon work panels, purple, yellow, white
People: possibly Delaware or Osage
Places: Southern Plains, Oklahoma
Purpose: social events, recreational activities

From interviews with Dr. Garrick Bailey, 2018-2020 University of Tulsa, Professor Emeritus of Anthropology