You could try playing around with this light blue denim, treating it as a double-sided fabric. Of course, the light blue right side is the twill weave typical of denim, but the back side has the same twill weave with the white threads on the surface, making it look like a heathered blue. Although it's sturdy, as expected in a denim, it's quite lightweight. It would make terrific pants, shirts, tops, shells, and vests.