We have found regular sized bedding can work much of the time. Some minor alterations are often just enough. Just because the shape in not perfect won't mean it won't tuck in and fit. If you are not staying on the boat mold
and mildew are the keys to really trashing the interior
and you often have some of it with any used boat
. Curtains need to be removable as they need to be washed more than you do at home. Curtains and pillows work for adding color and can easily be changed. Other than bedding - NO NATURAL FIBERS!
For upholstery fabric
avoid any material that has any percentage of natural fibers like cotton. Olefin is a good fiber.
If you want attractive dishes find a factory outlet and look for select seconds (Lenox has some nice stuff). They also have great sales in January that discount even more! You can find first class china
that sells for about the same as melamine (plastic) boat dishes. If you store them so they can't fly around in the cupboard they don't break as easy as you think. Store a few extra at home just in case.
You need to think about shopping
in places that are not boat stores. You can still use a lot of the same things you use at home provided they are stored properly with due consideration to moisture. Things need to be secured down so they don't fly.
Lightweight picture frames secure easily with Velcro.