Cowboy costumes come out in full force during Halloween. They never go completely out of style. Cowboy costumes are easy to make because so many of the items needed are either already in your house or cheaply purchased at the store. You can make minor changes to this costume to make it a cowgirl costume. You can go as elaborate as you like with this costume; people will know what you are even if you just have the bare minimum cowboy costume.
Pull together items that you already own that work for a cowboy. This might include blue jeans and a bandanna. If you have a child, you may also have a toy gun laying around somewhere.
Visit a consignment shop to purchase boots and a cowboy hat. These look best if they are worn and used, although you can go out and purchase a brand-new set if you'd like. Any colour will work, although brown is the most stereotypical cowboy colour. Cowgirls may want to go with white boots and a white hat.
Find or purchase a pair of brown trousers. They need to fit over your blue jeans, so make sure they are a little loose on you. Cut out the seat of the brown trousers to make chaps. You can also add some fringe along the outside of the legs.
Purchase a bandanna. Red works best, although you can go with a blue or black. For a cowgirl costume, pink or purple would work well.
Purchase or borrow a long-sleeve plaid or checked dress shirt. Button a black vest or buckskin jacket over it.
Look in the garage or shed for a long rope. If you don't have any, purchase some inexpensively at the hardware store. Knot a large loop in one end of the rope so that it looks like a lasso and then loop it over your arm.
Put all the clothing on. If you would like, you can add a fake handlebar moustache or uncommonly large belt buckle to your costume.