What happens next?

How to make a sun costume
Select some solid cardboard for making the costume from.
It should be large enough for your torso region or the torso region of the costume wearer. It should be sturdy enough for wearing (you don't want it flopping over).

Available choices:
* Make a depression shape on the back of the cardboard. Cut the cardboard in half so the side with the body lies naturally in the hole.
* Cut out two circles that are wider than your torso. Draw the circles first, then use a craft knife on a safe cutting surface to cut out the circles.
* Cut to length and paper the cardboard before cutting, if possible. Process the cardboard in a blender if you're making it in an art studio.
* Also, it should be tight enough that you can sleep comfortably without straining. Making the costume from materials will make the costume actually look like it's made out of cardboard, rather than foam or another combustible material.
Cut out two circles that are wider than your torso. Draw the circles first, then use a craft knife on a safe cutting surface to cut out the circles.