since this is also a costume I've also made a sword, shield, and helmet.
Warning this is a costume so don't wear it as actual Armour because its not and probably wont protect you.
Step 1: Materials
sheets of leather, (i didn't know where to find leather and figured it'd be expensive so i used brown vinyl and denim you will also need colored vinyl for the shield if you want it.
26 gauge sheet steel (you could use something thicker if you don't mind the weight and have something to cut it with)
(i used 20 gauge copper wire i got craft store that meant for jewelry making)
nails (i used both the sort of nails used for construction and the sort of nails used for trim)
a piece of wood (for hammering into)
paint (what ever colors you want for your shield)
tin of some sort (tin from corrugated tin roofs would work and you could probably find it at a junk yard)
a soldering iron and solder
(i think this makes it stronger but its not necessary)