If you're a fan of Alexander Dumas' literary works (and who isn't?), as well as generally fighting bad people with swords or pre-Revolutionary France, then you really ought to pick up the Musketeer Black Hat. The Musketeers are some of the most famous and most revered heroes in literary history and they've created an archetype unto themselves, so why not dress up as one for Halloween? Nailing down their signature hat would be a great place to start.
For the swashbuckler in all of us, there is the Musketeer Black Hat. All for one and one for all!