You could throw away all of the other camo crap that is sold and keep nothing but your face mask and be well on your way to success. I could care less about camo shirts, pants, boots ([beeep]?), etc... but face masks cover the most visible (and mobile) portion of the human form.
I like the ones that are sown to the bill of a baseball cap. You can do some careful head movement w/o much material movement to scan from side to side.
If hand calling, you can run your hands up under the mask to help hide the movement of your calling hand(s). Camo gloves do not provide that concealment - you still have motion in the open.