In fairness, the vote is 7-5 in favor of the Epilogue outfit. That's pretty close, considering the sample size.
And considering the Epilogue outfit would be more expensive to produce, it makes more sense to do the RDR1 outfit as the accessory outfit, and sell the Epilogue version as a bonus, if that's what it comes down to. Particularly, since you've already noted that John won't include the Epilogue outfit, but it may be sold separately later. Just have both Epilogue outfits as the separate packs.
Having said that, the disrespect for RDR1 just boggles my mind. Like, Arthur wouldn't even exist had John not come first, but people are like "Nah, first game is lame." I just don't get it.