Cowboy costumes are quite simple to make if you have an old pair of jeans, a plaid shirt and a cowboy hat. However, cowboy boots are quite expensive to purchase and because of their popularity they can be hard to find at your local thrift shop. To make cowboy boots for a costume, make boot covers out of leather or a similar material and place them over a regular pair of boots or shoes.
Check your closet for a pair of shoes or boots that have a heel similar to a cowboy boot --- it doesn't matter what they look like because they will be covered up by a boot cover. The only part that will be visible is the heel.
Cut two pieces of brown muslin that are roughly the same size and shape of your existing boot or shoe.
Put the boot on your foot and start pinning the two pieces of muslin together, making seams down the front and the back of the material. Make sure the seams are straight and hug your leg tightly.
Mark the seams with a fabric marker and also mark where you want the bottom of the boot cover to end.
Use the muslin as a pattern for the boot cover. Cut out the two sides of the boot cover out of leather or a leather-like material.
Sew the front seam and then sew a zipper into the back seam, leaving about one inch below the bottom of the zipper. When you sew the zipper, place it so that the zipper is facing outwards and can be zipped up from the good side of the boot cover.
Turn the boot cover inside-out and sew a neat seam around the bottom. Repeat the above steps to make a boot cover for the other foot.
Decorate the outside of the boot cover to resemble a cowboy boot. Draw stitching and patterns with fabric paint.
Sew an elastic strap across the bottom of the boot cover on the inside. Position it so it sits just in front of your real heel (of the boots or shoes you will wear). This can help hold the boot covers in place over your shoes. Sew or glue sequins or rhinestones in patterns on your boot covers for a more glitzy look.