As stage directions go, the The Magic Flute opens with a zinger. ‘Tamino enters from the right wearing a splendid Japanese hunting costume.’ That’s right, a Japanese hunting costume. What does that even look like? More to the point, what would a Viennese theatrical costume designer in 1791 have thought it looked like? Surviving evidence suggests that the answer was ‘nothing on Earth’, which is handy because it gives subsequent interpreters a huge amount of licence.