What's petersham in Finnish? I don't think I've ever heard the English term!

@Astatuutikki It's ripsinauha! Sometimes sold under hattunauha because you can use it inside the hat as well as on the hat brim edge, but ripsinauha is what it's actually called.

@Astatuutikki Grosgrain is something different again, it's much stiffer and less bendy! Gods know what that's in Finnish, then. Laakanauha, remmi? Kanttinauha is another one too!