I bought a beautiful vintage 40's nightgown a few days ago, and I'm in LOVE with the fabric. I searched high and low for a similar fabric, and got nothing.
And as fate would have it...I checked out regretsy and there was a link to spoonflower.
This site is SO AWESOME. I LOVE the concept.
you can even change the individual colors in your fabric!
So, if you truly can't find a certain material or print - and you absolutely LOVE it - try spoonflower!