At least I assume they are. As Welsh National Opera open their costume archive for public hire, they tell Wales Online “The only thing we’re not planning on doing is boots. They’re not quite as easy to clean".
One of the most prized items is sure to be Bryn Terfel's costume from 1990’s Così fan tutte. The then-svelte 24 year old who has "always been very good humoured even when there are two women undressing and redressing him" made his operatic debut as Guglielmo in a toga-style costume.
More at Wales Online.