As I understand it, the costume only unlocks for the mark XII version... dont hold me to that though, cant remember where I read that.
I got the MK 11 set and it´s stupid visuals.
Folks. i´m sorry if this dont help ya.
But let me tell ya somehting. Hope ya not disappointed as I was when you finally get the visuals.
The Mk 11 MACO uniform has no shoulderpads for the armor which looks ridiculous plus no gloves and no gauntlets.
No helmet also but this i knew as it was only for the MK 12 set.
But if I had known earlier that I was grinding for a set they made look so retarded as it is I would never have done the grind.