A worn-out old duster. The coat protects your clothing from trail dust, but not much else.
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—In-game description
It is a worn, dark brown, oil skin duster. This type of coat was usually worn by deputy lawmen of the time, likely the reason for its requirements, seen below. It was also a popular choice for bounty hunters.
Acquisition
This outfit is obtained after reaching the honor rank of "Peacemaker". The Duster Coat makes you fire-proof, and appears to simply be worn over John Marston's standard Cowboy Outfit.
Trivia
Even when playing as Jack Marston, John's Cowboy attire is still worn underneath the duster coat.
The Duster Coat bears a strong resemblance to the Legend of the West Outfit, albeit in a different colour.
Dusters have a long history in the West and Western movies, so there is likely no single inspiration for this outfit.
The simulated cloth of the coat is very buggy and is known to fall through objects or stick inside the player during moments such as when Marston sits on something.
It gathers dust very quickly.
When wearing this outfit, players may be fired upon by gang members in Thieves' Landing, likely for its high honor requirements.
This outfit is available from the start in the Undead Nightmare DLC pack.
There is a slight error in the outfit. While it is called the Duster Coat, a true duster would be open in the back, allowing one's legs to be protected while on horseback. The outfit seems more like a hybrid between a duster and a trenchcoat in reality. However, it does affect how quickly dust gathers on Marston's trousers.