I went to Joann's Fabric Store on their $1/pattern day and got pirate costume patterns, some unbleached muslin fabric and some brown fabric and had my alterations lady make a blousey, pirate shirt and some pirate knickers.
Then I went to Michael's craft store and bought a medallion that looks the part in the jewelry section and slipped a leather string threw it and voila! I'm set. I think I may find a scarf for a sash and borrow one of my DH's belts.
I know I'll embarrass my sisters by going all out and that is half the fun.