I was fortunate to receive a little over 6 yds of fabric which is a pleasing enough color for backing....turns out it is trenchcoat brown. I was told later that it was London Fog factory fabric. I will throw it in the washer tomorrow but are their any considerations I should know about before I incorporate it into a quilt? Is there any way to unwaterproof it or does it even matter? Some of it will go to a local warming center this winter but I'm thinking about just leaving some of it as it is and making outdoor coverings for the homeless? It's about double the normal weight of good cottons. Appreciate any imput.