Base success gives the mask on two of us, using 2 advantages to push that to all three (assuming we're leaving Janey at the hut). Also with the Realism would push the difficulty to see through the Mask to Hard, using the other 4 advantages to Increase it another 2 times up to Daunting (it specifically says "increase" additional effect and if I remember right that's add dice isn't it?)
Rolls
Mask (+Additiona,. +Range, +Realism)
4 Success, 5 Advantage, 1 Failure, 3 Threat
Total: 3 Success, 2 Advantage