Curtains on lath & fascias
The lath and fascia is a wooden board covered in the fabric of your choice and supplied with one or two corded metal tracks. The fascia is a 5cm strip covered in the same fabric as the curtains and hides the track when the curtains are open.
Lath and fascia can be made to fit bay windows.
This system is very good for bedrooms where light exclusion is important.