This is by far one of the easiest costumes to make. All i needed were a box, black duct tape, construction paper in 5 colors, glue gun, scissors, a plate and a cutter.
Start with a box. This one is 20×20×20.
Tape the top together. Place a plate and trace the outside of the plate.
Cut out the circle.
With a ruler (didn't have one so used a measuring tape) divide the surface of the box. I had a measurement of 1.5 and 1 inch for spaces in between and 5 inches for the square. Cut out rectangles for the arms.
Use duct tape to cover the spaces in between.
Use one of the discarded squares and use that to trace squares on the construction paper.