Neither of those examples look like the Haunted Mansion butlers costumes.
I wanted to do this as well a few years ago and I couldnt find any cheap way to do it and have it look like the real HM butler costumes, the only options I found was to buy the cloth required and make it, or, hire someone to make it.......neither were cost effective for me so I never went through with it. I hope you have better luck getting the right costume
Sorry for the confusion..i wasn't trying to say my suggestion was it. I was only pointing to probably the only other green tailcoat in existence haha.. seriously, google green tailcoat, tux etc and see what comes up...I guess disney pulled the colors on purpose to keep their costumes unique haha