The outfit is strikingly similar to the Deadly Assassin Outfit, with the only differences being the lack of an eyepatch on the left eye, a longer coat, a solid black vest, and Marston's typical hat rather than the special hat that the Assassin outfit has. However, the Deadly Assassin Outfit recharges dead-eye twice as fast, while unlocking the Legend of the West Outfit increases your dead-eye, but the outfit itself confers no perks.
Some players have encountered an unusual glitch which required the character to be arrested while wearing the outfit before the gloves would appear. Also, if your gloves go missing you can play a round of Five Finger Fillet with the Cowboy Outfit on and then change back and they will appear on you again. This is also the case with Marston's rifle holster on his back disappearing. The same solution of getting arrested will solve this problem.
When carrying a hogtied person, the back part of the coat will go up.