Cut a piece of cotton fabric to be 5 x 18 inches.Cut a smaller piece of the same fabric to be 2 x 10 inches.
Fold the larger piece of fabric in half lengthwise, with the pattern (good side) inside.Make sure the edges are lined up nicely and secure the fold with several pins going across the middle.
Repeat, folding and pinning the smaller piece together.
Sew along the open edge of both pieces, creating fabric tubes.Leave a 1/4 inch seam allowance on the larger piece, and a 1/8 inch seam allowance on the smaller piece.
Remove the pins and center the seam on the larger tube. Use your fingers (or an iron) to press down the fabric, smoothing it to either side.
Turn the tube right side out, using either your fingers or a loop turner hook.
Turn the smaller tube right side out as well.It's too small to use your fingers, so use a loop turner hook or a safety pin to help you.Now iron both pieces of fabric, making sure the seam stays evenly down the center.
Step 3: Sew in the elastic
Cut a 5 inch piece of elastic and attach a safety pin to one end.This will help you insert it through the smaller tube
Insert the elastic into the tube, pin side first. Push it through, but not all the way - just until the end meets up with the tube opening. Pin it into place.
Keep using the pin to pull the elastic through to the other side. The fabric will bunch up in the middle.Remove the safety pin, line up the other ends and pin the other end of the tube to the elastic end.
Sew the ends of the elastic to the tube, leaving a 1/8 inch seam allowance.
Step 4: Connect the headband pieces
Set the large tube down with the seam side down. Set the covered elastic down in the middle at one end. Make sure the elastic seam is facing up. (Both "good" sides should be touching.)
Fold the edge of the headband around the elastic and pin the fabric together.
Repeat on the other side. Make sure the folds match (eg. the same side is on top).
Sew together both ends, leaving 1/4 inch seam allowance.
Remove the pins and pull on the headband near the elastic to hide the seams inside.Twist the rest of the headband so that the seam is on the inside.