Yeah the best cammies that seem to blend in with Omnipat are reportedly Multicam, I have a full set of Propper Multicam ACU style cammies and I have my mask covered by the Special Ops Omnipat mask cover. Best thing I ever did, the material is mesh and blends right in very nicely with my Multicam and it allows my mask to breathe. I bought another mask that was very wll ventilated so that it would likely breathe right. It did especially with the thermal lense and JT lense cleaner. I had problems at frist till a veteran friend gave me the tip "spray on the inside then let it dry and you won't have problems with your thermal goggles."
I don't even bother taking the mask cover off.
But MARPAT is really great for me to use in the summer for me personally.
Can't wait to get my Multicam custom vest from Special Ops
They are in the process of making it at the moment.