For the sash, I just used a piece of Monks Cloth about 5 feet long and about 8 inches wide.
I just wrap it around my waist so that the last bit ends up in the back and tuck it in. I wear the Swedish Mauser Bandolier as a belt and that holds the sash in place.
And that’s How I made my Sash. Hope you found this useful. Feel free to contact me with you have any questions or comments.