Hello, Michael here. This instructable demonstrates my idea for a pseudo-chainmail costume. At this time it is only conceptual, but I'm certain the results will only have minor bugs.
Materials & Tools:
Black Mesh Cloth (link below demonstrates a laundry bag that would work nicely)
Silver Spray Paint (or other metallic color of your choice)
Needle & thread (black preferably)
beads, or tiny fishing weights for adornment and the illusion of weighted rings (optional)
Paint: (might work better than the paint I plan to use because it is meant for fabric.)
*Tip #1: The width of the mesh will be a real selling point on the chainmail effect. To my eyes the bag in the link has a really good mesh size.
DISCLAIMER: IMAGES USED IN THIS INSTRUCTABLE ARE NOT MY OWN! THEY ARE FOR VISUAL AID PURPOSES ONLY! THIS IS ONLY A PROP, IT WON'T PROTECT YOU FROM ARROWS, SHARKS, GRUMPY CAT, ETC.
Step 1: The Torso of the Tunic
Forget the sleeves for just a moment and focus on the torso.
Find a shirt that fits well, especially around the torso.
A shirt like demonstrated in the photo is comprised of a few parts, the important ones right now are the torso sections. There is the front panel and the back panel. Basically two rectangles that are roughly the same size and sewn together along the and top to make the basic shirt.
Make two similar panels out of the mesh material, but allow an extra inch of overall width for seam allowance.
*Tip #2: Making the front and back panels about 6 inches(15 centimeters) longer will give the tunic a more realistic look.