This style of robe (kimono) was fairly common in the '70s and you can still find a lot of similar designs even if they aren't identical. Frank's robe was probably silk (most were), and it has a red lining (which is also common). The dragon is red and gold, and there are some embroidered clouds on the front chest.
I realize not every cast performs this scene, but I think it's hilarious when they do. Our cast used to have a mask with spackle to look like cold cream, and a wig with rollers tied up. Always got a nice reaction from the audience - although it helps if the other Floorshow performers are already on stage.
