I have to agree with senor mechanico about the condition of the fabric.
It really depends on how you choose to solve the problem. I see you are in New York
. Surely there are fabric stores there. If you sew (or your partner does) perhaps selecting new fabric and replacing the plaid is in order. Cushions
are easy to sew, and it is not difficult if you want to make piping for the cushions
. That is a matter of taste.
In our cruising from Mexico
to New Zealand
, we saw lots of "island" fabrics used to cover cushions. And sarapes.
If you are concerned about re-sail, then get new marine upholstery fabric, but you will pay a lot more for it than IMO it is worth.
If it were me, I'd go look at discount fabric shops and see what I thought I could live with, and do all the cushions the same. Pick colors that will hide ordinary grime.