Easy Ridir Giggles wrote:2/3 of the actual piece has to covered by metal, so your rings would have to have a very small ID like the aforementioned fender washer. I don't know how else you would do it.
Incorrect. Here's the exact rule:
3.7.1. Studded, scaled, or brigandine Armor can only be counted as Armor if 2/3 of the target area is covered by metal or leather, or the studs/rings/plates can not be no more than 1/2 inch apart.
Yes, it's cheesy and loophole ridden. You could have, say, an 18" square piece of leather with a 17.5" diameter 12 gauge steel ring, and it would technically be legal. At what point ring mail switches from armor to a cheesy terrible piece of ****, however, is up to the weapons checker in question. No one is going to pass armor if you're intentionally trying to cheese the rules.
Theros has a skirt of ringmail that's made of less than armor grade leather and perhaps 12-14 gauge rings -- the rings are probably 3/4" to 1" in diameter. The
rings cover more than 2/3rds (probably like 95%), but the piece itself is probably covered by about 20% metal. I've seen this armor pass at many, many events.
As for the armor Giggles posted, I would probably pass it, and I've no doubt that 99% of checkers would as well.