Take your desired width of fabric and add 1 inch.

Measure your height and double it.

Add 2 more inches for the channels that you will thread your tape into.

Cut a piece of the metal measuring tape the same as the desired width.

Turn over an inch of fabric to the wrong side and sew across making a channel.

Slide the piece of the metal measuring tape into the channel with the convex side up.

Repeat on the other end.

Fold in half with right sides together and sew side seams just outside the measuring tape.

Flip right side out and enjoy!