answer:Polyestere does not shrink. Rayon usually shrinks like crazy. I have a feeling with that ratio the garment won’t shrink much, not sure. Throw it in the dryer after you wash it, see what happens. Not too high a heat since it is mostly synthetic. Rayon also can wrinkle a lot, deoending on the rayon, but I doubt that will be a problem with all that polyester.