There is a fabric store in Portland that sells very wide fabric for tablecloths. I have made my daughter two of these. The fabric width is I think 72 inches, but may be even wider. I know this fabric is available and probably available on the internet somewhere. I have made napkins from this same fabric - it's polyester so it's not as nice to sew with as cotton, but it works. I have done embroidery on the napkins as well. The embroidery comes out very nicely.
If you want to use 100 percent cotton, you might encounter problems unless you are willing to use quilt backing fabric which comes in very wide widths. Not as easy to launder (and iron) as polyester though.