Welcome to the club, Larry! The short answer to your fabric question is that it will be hard to match the old pattern. But when we needed new covers, we worked with a local upholstery shop -- they had books of fabrics to choose from.
If I recall correctly, new cushions and covers ran around $300, but that was a long time ago.
If this is your first RV, ask lots of questions! (And even if it isn't.)
2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation)
2013 Toyota Tacoma Off-Road (semi-beefy tires and components)