The binder for a trailer of that age would have had one, maybe two, forms that contained the name of the interior color. Both of which would have had it hand written and likely abbreviated, but many times at least one of these forms disappears from the binder. Luckily the brochure has clear enough swatches to help define the colors.
Good luck finding your fabric! It's out there, it just takes time.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR