Experience a Curtain Call

Decide whether to mount the board inside or outside your window frame; measure accordingly. Cut your board (or have it cut at your local hardware store). Measure your window, and use these measurements to mark your blanket adding ½ inch to all sides. (If mounting board above the window, add enough length for the blanket to reach the sill.) 

Cut two identical panels of blanket (to help block the light). Stack panels and blanket-stitch around the sides and top. (You can sew the bottom shut, if desired.) Sew a few small cross-stitches in the body of the blanket so it doesn’t bunch.

Punch small holes in the ends of each of the straps, one for the snap, one to mount to the board. On your snap sides, cut a rounded edge on the straps. (If you use canvas straps, glue the ends to prevent fraying.) Use your hammer and the setting tool to attach the female snap assembly to the straps, with the open end on the rough side of the leather.

Divide the length of your board by four. Measure in from either end by that amount and place your snaps.

Lay your blanket over the board, ¼ inch over the top edge and centered widthwise. Using the screws with the male snap piece, screw it through the blanket and barely into the wood. Lift up and put the straps (rough suede sides up) into place and then completely screw into the board.

Use glue to secure the top edge of the blanket to the board.

Level the board over your window and screw in place.

Fold, roll, or accordion your blanket and snap in place.

Variations:
Use contrasting embroidery thread instead of matching thread to blanket color.
Find a blanket with tags, markings, or embroidered initials for added interest.
Add snaps to the middle of the blanket so you can snap it open halfway.