Another way to design: collage! As minerals inspire me, and I wanted to use "crystalline volume" for the witch look, I printed a couple of crystal images, and made collages.
The first row are the collages, the second and third row are each side of the originals mirrored. This was a fun and relaxed way to experiment and come up with ideas. Obviously the finished clothes won't look like these collages, but it helps you get ideas for the silhouette or texture and proportions. I used an illustration I made a few months ago as a base to collage onto (as I'm not that fast at sketching bodies).