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Zach does have a good suggestion if your wanting to change the existing "covers" (factory material). I've installed quite a few Katzkin systems. I have a set I'm sitting on for the time being (other mods to be made first).
Wet Okole are actual seat covers that maybe up your alley. You can take these and wash these. Also to my understanding, these things are waterproof (where openings are not present). You also retain your factory material.
I've never owned a set myself, but have heard some decent reviews...
When I bought my truck it had 145,000 miles and the seats had been covered with Wet Okole seat covers it's whole life. They werent included with the truck but the interior looks brand new with no noticable wear on the seats AT ALL.... seams like those are some quality covers!!
I just installed the Cabela's Trailgear covers in my 07 F-150 with 40-20-40 bucket back seats and the belts are built into the seatback. I would not and did not give a favorable review of these covers for these seats.
Go to exactseatcovers.com and see what they have to offer. Great fit, great service, and the materials hold up very well. I had them in my '05, and now in my '08. Cost for front seats and rear seat was under $100. I recommend them highly!