I've used natural (sadly, natural = rough and itchy!) fabrics to try look as rustic as possible without being untidy... mostly linens and cottons, with a touch of burlap.
I went for the pirate hat version, because it's been a hope of mine to cosplay someone with a pirate hat, although I never thought it would be like this! I made the hat from a thin faux suede, with foil lame appliques.
Any questions, yell out~
THIS COSTUME IS FOR SALE! If you are interested, please find the details in this gallery -> https://www.facebook.com/media/set/?set=a.1089106294433054.1073741828.489618487715174&type=1&l=176a6d2297
"Best Group" (with 13-Zer0's March) at Supanova Cosplay Festival (Brisbane) 2010