Hubby has a wash cosplay that he does at least once a year.
He carries around a pool cue with dinosaurs tied to it. He uses the cue as a stake through the gut.
(I have no pictures though).
It's simultaneously awesome and awful.
Oh, and my website Land of the nerds (see my siggy) Is going to do a "Firefly Month" in april, with all kinds of articles and stuff about the show and the fandom around it.
Feel free to let me know if you have any special browncoaty memories