My son recently discovered Voltron on Netflix and has been obsessed ever since. His Kindergarten had a costume party for Fasching/Carnival, and even though the theme was "Under the Sea", he insisted on dressing up as Voltron.
I made the arm and leg "lions", as well as the face mask (i.e. the head of the black lion) by carving holes into the styrofoam blocks that my sewing machine came wrapped in, and then we painted them together. The chest piece is an amazon box it holes cut for his arms and legs, and it's held on to his chest by elastic bands that corss his back. I made the decoration on the chest piece by gluing on craft foam pieces, similar to how I made the Paw Patrol badges (scroll down in my projects to see).