If you look at this particular design it isn't really that hard to recreate. you will need to do some leather wet molding and that will probably be the hardest part because you will need something to mold onto. The top piece is basically built like a short cone. Check in housewares for maybe a funnel or bowl of similar shape / size. Then you have a long straight rectangle for the middle piece that would wrap the circumference and finally the facial piece which is built similar to a hockey goal mask. With it being Halloween time you can probably find some plastic cheap goal masks in costume pieces you can use to mold the leather onto for your finished look. You would probably use about a 4 to 5 oz leather and soak it in hot water to get it to tighten as it drys. This will give it a rigidity to look like the metal counterpart. You may even look for a plastic similar designed costume helmet you can use to mold your leather around.
I made a roman armor chest piece using a plastic Halloween costume as my wet mold and it came out pretty cool. When you are wanting to take on this type of challenge you just have to visualize what looks like it that would make a great mold for wet sculpting.
Here is a plastic one currently offered that may be worth trying to recreate with leather wet molding. You can use the plastic as your template. https://www.spirithalloween.com/product/48083.uts#.Wb0hYeJqBZM.gmail
This is the end result of leather wet molding I did using a plastic roman armor costume piece as the mold.