http://dailydorius.blogspot.com/2014/06/diy-01-knotted-sailor-headband.html DIY: Sailor knot headband! This is super easy to make and the tutorial is easy to follow along. All you need is a pair of scissors and an old t-shirt!:
DIY headbands they look just like those Under Armour head bands! ~ I made on, and as a tip: you might want to practice the braid before making the actual headband. It's very hard.
Diy sailor knot headband . The link to the original one is here https://domesticingenuity.wordpress.com/2013/08/19/diy-sailor-knot-headband/ I only put the pictures together
Headband out of old t-shirt
Instructions: DIY Nautical Knot Headband/belt what to do with old t-shirts