We bought light blocking (blackout) cellular shades at HD that were very affordable. We found a size that fit just inside the window frames but they can trim to length or you can mount outside the window frame. However, those odd size windows could hurt your options.
Let me know if you need more info and I can probably dig it out. [ETA: they were Bali blinds]
Thing about cellular shades are that you raise them to get more light, close them for less. Double up on another window covering for even less light.
In our case, we needed blackout shades and also have drapes over each window. The wife works nights and it's like a tomb for her even during the brightest days.






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