Well...I mulled it over and went back for the coat. It's not 100% accurate, but it's damn close. I figured it was an easy enough costume and I've already got the beard and hair for it. But if something happens I can always sell the jacket down the road if I needed to. Let me know what you think.
I agree, that jacket is pretty close to screen accurate (and I'm judging this from the picture and comparison to the screencaps I've done of Mac's jacket in the film). It's pretty close.