Personally, I would go for a modern, but conservative fabric. From what I've seen, even in the most conservative restorations that I have seen rarely do the owners go back to the old original look in the fabrics they use. You want it to look fresh, right? Using the original fabric patterns may be more likely to take you in the opposite direction (old, stale) in the eye of the beholder.
Well, unless you are going to get the matching shocking orange shag carpet...
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“Courage is being scared to death, but saddling up anyway.”
...John Wayne...........................