Well, that'll teach me :-(
I bought some fabric at Walmart, Waverly fabric, the color of which perfectly matched a table runner and placemats that my DIL and I sewed for their new dining room table. I don't usually, make that never, pre-wash so I happily began to sew the squares the 17 inches they recommend for napkins. I had pinked the edges to it wouldn't fray and sewed that down.
I just took them all out of the wash, I usually wash quilts, etc. before gifting them and there was this tangled mass of napkins, threads coming out of everywhere plus they had shrunk almost 3 inches each. Now I'll have to carefully try to turn under and hem again.
Just a cautionary tale, if you buy Waverly fabric from Wally World, you should wash it first