One of the best types of curtains for bay windows is the valance curtains. This is a type of curtain where it is placed over the top of a window with a short length to leave most of the window uncovered. It can be a decorative fabric usually combined with long pleated curtains on the sides. One of the most common kinds of curtains under valance curtains for bay windows is the balloon valance where the fabric balloons out to create a wave effect.
Valance curtains for bay windows can be very aesthetically pleasing as well as functional because of the advantage of having ventilation and day lighting. These can also prevent drafts from entering the room and can cover edges of fixings around the bay window.
This type of curtain may be good at letting in sunlight in but can also be a disadvantage when privacy is needed. Applying this window treatment should depend on the type of room.