Vintage Canvas Drawstring Pants Natural Cotton PrB

Unstructured canvas pants in a natural unbleached cotton. Probably martial arts - karate pants although from an artist's estate (stored with painters aprons & smocks). Comfortable, washable. No fly, zipper, or elastic. Step into with drawstring waist. Condition good, small storage spots - may come out with stain treatment - see pics. Slit repair, well done. Washed and dried. All original. Estimate 80's, could be earlier. Knee patches. Length 38", waist up to 40", rise 14", inseam 29", Hips 60"