I spotted this Steampunk Dress over the weekend by Gracefaerie Designs. It's a custom dress, overskirt, and crinoline for small, 1/3 scale dolls.
As Momma delicately put it, while I am 1/3 scale, I am not small. (She even had to do some "liposuction" on me once so I could fit into my clothes.)
However, that being said, she thinks she can alter this to fit me.
As for the fabric, thankfully Spoonflower has lots of steampunk fabrics. Spoonflower is an online site that permits people to design, print and sell their own fabric designs.