To tell if a shiitake mushroom is fresh, it should be thick, have a rounded cap that is not too open, have clear folds on the underside of the cap, and be closer to white in colour. one-piece is made from dried shiitake mushrooms, but the top is made with ivory fabric on the back to give it the colour of fresh, raw shiitake mushrooms. The ivory pleated fabric is used not only on the back but also at the hem of the front to emphasise the colour scheme. The sleeves have gathered cuffs to give them a slightly rounded shape.