Nothing so sophisticated as Sugarveil
. It's RI.
Being of Czech origin I used to see them quite often. It's a traditional style of decorating gingerbread cookies (similar skills are used to decorate Easter eggs - real eggs, in this case using different colors instead of RI). These patterns are hundreds of years old and originated in small villages, mostly in the eastern part of Czech Rep (Moravia), created individually by local countryside artists. I doubt she will reply soon, these artists are usually of a certain age (they don't go on-line so often and don't speak English). They learn to decorate from their mothers and grannies, it's something like a family tradition, so they have been doing it all their life. I've never really asked about details as it seems like something out of this world
and don't believe it would be possible to create something like this without years of practice (or Sugarveil?). HTH