Go Run Your Own Little World
A Firefly LARP
Clothing in Firefly is an odd mix of modern, oriental, and western. What you wear is largely dependent on your character's background. Brown Coat Costuming is an excellent site for costuming guides and this website has some good screen captures to model after.
Most of the border worlds have a western style to them, relying on rough and even home-spun clothes to get them by. The norm is a shirt, pants, suspenders (on those who can wear them well), a vest or long-coat, and holster(s) for whatever heat you want to pack. Woman generally dress like the men, or for those border world bells- a fancy dress (see right panel). Cowboy hats are fairly common, but only fools or those looking for a tavern brawl wear a 10-gallon hat.
Bonnets are generally reserved for females, but a few intrepid individuals enjoy breaking down gender barriers.
The core planets err more toward the modern look of suits and ties. Oriental clothing is less for work and more for casual-wear, although those spending time in the local Chinatown wouldn't look terribly out of place. Your clothing may be more eclectic if you come from the seedier neighborhoods, which is often a hodgepodge of different styles. Most still have a tinge of western or futuristic styling to them.
On a Ship
Whatever floats your boat, but anyone who works on a ship will tell you it's a bitch working engine duty when you are wearing a kimono. Comfort and utility are the watchwords here.
Being stuck right in the middle between the core and border worlds, Beaumonde is the hotpot of culture. A clash of modern, oriental, and western, everyone seems comfortable wearing whatever they want. Mixes of styles and futuristic costuming is more prevalent here than most anywhere else. Oriental culture in particular is very big here- tea, kimonos, and hot dogs are part of every day life.
Military uniforms of the blue-gray variety.
Something like this:
Mostly western in style, but a two-word summary would be:
Here is your typical ruggedly handsome Brown Coat.