I used two layers of blackout cloth from a local fabric store - It is quite thick and normally used as a curtain liner.
To attach the material to the window frame, I use self-adhesive velcro strips. One side stuck to the window frame, the other to the blackout cloth. Don't sew the stuff on or else you will end up with a nice neat row of pin holes providing a line of light leaks.
A similar arrangement works over the door.
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