Wooden indoors shutters may be better than traditional curtains.
Shutters give more privacy than the traditional curtains and hold the cold or heat out. They last a long time and add that homey feel to any room. To clean them, just wipe down with a damp cloth versus throwing curtains and sheers in a washing machine. Also, they do not sag and wrinkle.
The disadvantage is they cost more than curtains but are offset by not having to continually buy new ones.
Indoor shutters can be painted or stained.