Coolest Homemade Costumes has a collection of Halloween scarecrow costume ideas, including patched shirts, straw hats and blue jeans. About.com also has an article on how to put together a good scarecrow costume for Halloween.
Many of the scarecrow designs posted on Coolest Homemade Costumes can be made for less than $20, as of 2015. It helps to use old clothes for homemade scarecrow outfits, as the costume should look old, ragged and dirty. To complement the standard straw hat, a costume creator can sew mismatched cloth patches onto blue jeans and flannel shirts. Corn husks and straw stuffed into the sleeves of the chosen shirt is also a common element of scarecrow costumes.