I’ve been in Flanders, that is famous for its lace making (among other things ;-)) and I watched how they’re making lace from Lier.
Actually they ‘only’ crochet yarn with a very fine crochet hook in chains on tulle.
But I’ve been impressed by the patience you need to make such an immensely fine work!
Links:
Lace from Lier (“De Lierse Kant met al zijn pracht”) (English)
=> click on ‘How does it work?’ in the left menu
Lace from Lier (“De Lierse Kant met al zijn pracht”) (Dutch)
=> click on ‘Hoe werkt het?’ in the left menu