[Jon Stratis]

I agree, ask on the Q&A. When I read it, I read the intent as allowing reversible bumpers - the flip portion, while technically two layers of fabric, can be thought of as one. When you look at the folded over seam on a shirt or pants cuff, you don't think of it as 2 layers - it's two layers that are permanently joined with stitching to make a single unit.

I'll also mention that I don't see a way to use two strict layers of cloth to make reversible bumpers - you would need a single piece of cloth that has different colors on each side. Sounds like a very complicated dye job!