Different fabric worked. Yeah! The original cathedral window design used gold lame (picture an accent mark over the 'e'), but all I found was a stretch tricot version that didn't work the least bit well. Then I was going to use satin, but couldn't locate my stash of it. Found a burgundy polyester in my doll clothes supplies and it worked just fine, although I do feel a little bit like I'm in the story of Goldilocks and the Three Bears.
Anyway, I'll be offering Cathedral Window Ornaments. They're two-sided, lightly stuffed, and have a stretchy gold cord for hanging. They measure about 3" square. The center square will vary but will be a holiday themed fabric.