we had bought pirate costumes for dw, ds and dd. there are stores called party city here that carry all occasion party supplies, so they had halloween costumes out already, which included a wide selection of pirate paraphenalia. i had some shorts that were long, below the knees, which i wore with pirate boot tops.
dw's costume was a lady pirate costume which came with a hat, scarf, one piece puffy shirt, vest and short striped skirt, and boot tops. they also had a pirate wench costume, and another costume call buccaneer bride. i can't remember who made the costume. our kids will be using theirs for halloween.
as far as accessories, we bought the eyepatches with earrings, plastic pirate swords and sabres, etc.