Fur-covered helmet has some fundamental utility, although I question the implimentation of the posted concept.
Israeli
Floppy Helmet Cover may have some utility. Since helmet/head is often exposed to enemy, the enemy learns how to recognize typical helmet profile. Obscuring the helmet profile can be very useful. Trained enemy often can recognize typical headware profile, such as Boonie Hat and Ball Cap.
Added vegetation/other materials to helmet/headgear may or may not be useful in all conditions. Always problematic on how to attach such items so that they are not pulled-off somehow. Under NVG vision, such
ad hoc add-on items might be counter-productive. Recall that most Boonie hats have loops for attaching head-obscuring camouflage items.
NOT an expert, but I reckon head/helmet recognition by enemy can be of
significant concern.
Again, NO Expert, but common sense tells me that finding effective and durable ways to attach suitable items to one's headgear in order to disguise/camouflage typical head/headware/helmet profile is of
highest possible utility, since that
vital part of body is often exposed to the enemy.
Suggest wearing >>decent<< protective eyeware is just a notch down from all this helmet camouflage. Dirt injected into your eye(s) makes you a casualty.