Since taking up running again, I've had to battle with how to keep my hair out of my face now that it's too short for a ponytail. Big, fat headbands are the solution! They're tall enough to keep all my hair from blowing forward into my face (and also cover my perennially cold ears), but thin enough to scrunch up under my hair at my neck without being bulky. Have a lot of knits scraps? Have unruly, pesky hair? Have ten minutes? Let's go!
Fabric requirements: You really need fabric with lycra in it so that it will not only stretch but recover enough to stay on your head firmly. Interlock and 100% cotton jersey are a nope.
On the fold, cut your fabric so that it is 24cm wide (48cm unfolded) by 17cm tall.
Press the raw edges towards the wrong side by 2cm.
Right sides facing, sew the 17cm tall raw edges together.
Hem the long edges that you previously pressed in step two. I'm using a coverstitch because I'm lucky enough to have one, but you can also use a twin needle in a regular machine, or any other stretch stitch that will stretch without breaking. That's it!
Optional but not recommended: Have a child steal it.