Idea for inexpensive room-darkening treatment mounted outside the window frame?

Question by EllenElaina: Idea for inexpensive room-darkening treatment mounted outside the window frame?
Window is 76″ W 64″ H

Child’s room

Already have blinds mounted inside the frame that don’t block much light, but they have to stay.

Best answer:

Answer by Mary D
Plantation shutters are better at blocking light than blinds, but if the blinds stay, you should consider using drapes that are thick and dark. Between the blinds and the drapes, this should be a very effective way to keep out light.

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