I agree. The stuff doesn't work.
But here's a hypothetical question. If it did work. If it was 100% effective in blocking human scent, would you consider it fair chase to use it?
Fair chase has a lot of definitions. One is that the animal has to have a reasonable chance for escape. Thus, hunting behind high fences is not considered fair chase. Other, more expansive definitions would regard as unfair chase anything that takes unfair advantage of the animal. Shooting an animal caught in a fence, for example, or swimming, or with its antlers locked with another, etc. Would such a garment, if it existed, be taking unfair advantage of the animal?