Purchase the fabric here via Spoonflower! If you order today, March 10th, Spoonflower is offering free shipping! The printing/shipping process usually takes about 3 weeks, so order now to have these ready to go by the March for Science.
Make sure to choose "Performance Knit" as your fabric. 1 yard will make 20 seamed headbands and 3 tie-in-the-back headbands. Contact me if you would like to see other designs!
The instructions are in the image below. Click here for a printer-friendly pdf. :)