Why not express your own taste...
Interior upholstery fabric is interior upholstery fabric--whether it's on a boat or in a house. On a boat, it just needs to be durable, stain resistant, and color-fast. And the fabric selection at local discount "fabric warehouses" is MUCH larger than any "marine" upholsterer will have...and you can take your existing cushions, along with your own fabrics, to any good local upholstery shop for recovering or even foam replacement for less than most "marine" suppliers will charge.I've redecorated 3 boat interiors...never used a "marine" fabric supplier yet. The previous boat had been done 6 years earlier and still looked new when I sold the boat...the current boat interior is only 3 years old--too new to judge, but I'm not worried. Best of all, my boats reflect my own personality, not some boat builder's or a compromise based on an upholsterer's limited selection.