Going to costume party dressed as a pirate, how to do my hair?

Get it curly, tie on a bandanna and fetish-it-up. That is braid bits of colored yarn, cloth, string, feathers, beads, key chains, interesting bits of necklaces, charms, pendants. Have some dangle. Use hair spray to hold this stuff in place if need be. Add a spicy scent to your hair if you have something like that. Look at pictures of Captain Jack Sparrow for Inspiration.