~ Cardboard. and lots of it (approximately 2mm thick or so, no thicker than a pizza box)
~X-acto knife or scissors (BE CAREFUL!)
~Printed out templates found here: http://www.thedentedhelmet.com/f25/updated-printable-armor-templates-various-sizes-7825/
~cereal box cardboard, (the stuff with a shiny surface)
~green spray-paint (or whatever color paint your armor shall be)
~silver model paint
~paint brushes (small)
~time (about 10 hours or so depending)
~oh and craft glue. I do not recommend hot glue, as it dries quite quickly, leaving little room for error, and will leave a gap between layers. I recommend Beacon's 3 in 1 Advanced Craft Glue, but any craft glue should work.
Step 1: The beginning.
Cut out the templates. Please note: the back and crotch pieces are multiple pages long, and should be assembled and taped together before you cut them out.