We already have Tinker's Construct integration, so why not add integration for it's most popular addon?
Although it is quite OP.
I know MystAg adds armor on it's own, but some people would want to combine it with other materials' traits.

Version 6.0.5 adds support for the built in Tinkers' armor.

I'm going to move this to the agradditions repo as it belongs there. If this addon is updated to 1.16 I'll look into adding support for it then.