http://filmjackets.com/forum/viewtopic.php?t=170
"Good news and bad news. The good news is that there is some information available about the jacket. I have compiled information from a few sources below. The bad news outweighs the good news...
My understanding about this jacket is that it was based on a jacket that Foster reportedly saw in a museum.
Ariane Phillips, the costume designer for this movie was quoted as saying that "the opportunity to confound expectations and outfit an outlaw in white was too tempting to pass up."
Ben Foster, who plays a savage henchman in the film, sports a fitted, bone-white leather jacket inspired by a Civil War-era coat. The double-breasted slim-cut jacket also boasts tails and brass buttons.
Phillips had to construct eight different jackets to endure the blood shed on screen during the production.
My fear is that this jacket was custom-manufactured for Foster and unless they offer it for promotional purposes, it may be unobtainable. Maybe your best bet is to ask Peter from Wested if he would be interested in making one for you.
The front is similar to the "Rocketeer" style jacket. The tails may be a bit of a problem, but he has probably made something close."
Q: The white leather jacket you wear in 3:10 to Yuma is pretty … fashion forward. What's that about?
A: We were going over archival photographs of outlaws with our brilliant wardrobe designer Ariane Phillips, who did Hedwig & the Angry Inch and Walk the Line, and we all came to the same conclusion that outlaws were the rock stars on their generation. We wanted to pursue that idea aesthetically, so Ari found the jacket.
What we liked about it was it looked like bleached bone, something you might see in the desert and there was a sense of royalty to it that went with the name Charlie Prince…
After looking at the photographs, if it was rock and roll, it seemed to be glam rock. So we watched a lot of glam-rock footage."
Taken from here:
Also from Starboy:
In searching the history on the jacket I have found that it was a period correct Civil War jacket. I found a photo (seated, from the knees up shot) in Civil War Times of Then Maj. Lawrence S. Ross wearing the exact jacket. Even though the pic was black and white the material in not cloth or a like material.
After more research I found that Ross was a Major, a Colonel, and a General of the 6th Texas Cavalry. The Texas Confederates had more access to leather than wool or cotton and many had their jackets made as such according to Civil War experts and references from Texas.