Gillian, you will love the tussah silk. I didn't really appreciate it fully till I ironed it and brought out the shine!! I finished it by delicate cycle in my washing machine (It's a front loader). Carefully draped to air dry till damp, then did a hard press on the wool/silk setting on my iron. Then I tossed the whole thing in my dryer on the low heat setting with a couple of damp bath towels.
Did another final steam press on the wool/silk setting.