T-shirt works well T-shirt with long sleeves works great Fold the collar part under at the front, then let your fingers stream toward the ends of the T-shirt sleeves pulling it taught and lacing a one strand knot then while holding the knot in place with one hand use the other to pull a fistfull...

...just above the knot about 4-6 inches of fabric as to loosen the overall feel. .may take a couple of pictures over this weekend.. works great if you are streaming sweat and is cooler when wet 😎