Amy Butler dress material problem

I bought a pattern for an Amy Butler dress about a year ago but have been finding it tricky to find a material to make it from.  We have a couple of material shops near by and I go in and see many things I like, but when I try to imagine them as a whole dress, rather than just a small flash of pattern I can’t do it.  Which is a shame because I think the dress pattern is really nice.

It reminds me of one of the Sweet Valley High books I read as a kid. (I preferred the Hardy Boys, but I guess the library must have been out that day) In the story the twins Elizabeth and Jessica are in a magical world where they can make whatever they want just by imagining.  This meant that Jessica who loved clothes had lovely soft beautiful things, while Elizabeth who was more practical was left with more cardboard cut out clothing.  I don’t remember much else about the story, just the knowledge that my clothing would be more like Elizabeth’s if I was ever in this situation.  I might not be imagining clothes out of nothing, but I think I’m in a similar situation.  I guess I will just have to keep looking.