You will need:
Your desired length of WOVEN FOE. I use 12" for a newborn, 15" for 4-12 months and 17" for 12 months to 3 years.
A needle and thread
hot glue or decent fabric glue
a small piece of ribbon to make your headband interchangeable. The length of the piece of ribbon will depend on the width of your FOE.
A clippie to add to the headband when finished.
Join the two right sides of the elastic together and run a lighter across to create a seal for stitching.
Then begin sewing the ends of the elastic together with the shiny side on the inside. It doesn't have to be perfect

The idea is to have an extra support so that the headband doesn't come apart when stretched.
This is what it will look like when stitched
Run a line of glue accross the seam on the wrond side of the elastic and place your piece of ribbon on it
Bring the elastic across the right side but don't glue. You want to make a space to put your clippie in.
And then glue on top of inner side again on top of ribbon
You now have an interchangeable headband which you can embellish with whatever clippie you want.
And the finished product!