Female pirates were just as ruthless as male pirates back in the day. For a woman's pirate Halloween costume, your attire will be both tough and attractive looking at the same time. The complete outfit will consist of a blouse, scarf, skirt, vest, boots, earrings, pearl necklaces, bracelets, and cutlass.
The last four accessories can be purchased at any novelty store, so don't think that you need to wear real jewelry or have a real cutlass weapon. These are just for show. The front of the vest should have lacing to tighten it on you. It will likely be made of faux suede on one side and flannel on the other side.
The blouse should be white colored and rather loose. The neckline is elastic, and the cuffs of the sleeves should be jagged. The skirt needs to be a dark color, preferably black, and with a small apron covering it. As for the scarf, this will be tied around your forehead area. Make this a red or white colored velour scarf and let the excess fabric hang down over your right shoulder.
The boots will come up past your ankles and just under your knees. They can be black boots and rather sexy if you want. It depends on what kind of image you want to portray as the pirate. Some women will want to look completely tough and wear an eyepatch just like a man would. Others might want some more sex appeal by applying a little bit of lipstick and eyeshadow makeup.
The jewelry is something you can have fun with. Some women may want to wear lots of pearl necklaces while others may prefer gold necklaces and bracelets. But one thing you should try for is the earrings. Make them really big and elaborate, like with tiny skulls hanging from your ears. Either that or just leave them out entirely.