Excitingly, I recently won a set from Fleur of England's biodegradable synthetic lace Deilen range!
I wrote about this collection last year - it's something I'm very interested in at a personal level, since I've pretty much cut out purchases of new synthetic-fibre clothing from the rest of my wardrobe, but adore lace lingerie (which is almost always synthetic).
I'm still somewhat skeptical of the sustainability claims to be honest - sounds too good to be true, but I really hope it is! These same fibres are already being used by numerous hosiery brands, so I imagine they'll soon get picked up by other lingerie brands too.