I have seen the photos and some of the discussions about Boba Fett's balaclava and its construction. I do see the chin strap and it makes sense that the chin strap would originate on the balaclava and loop through rings on the helmet. This would hold both items securely to the head. What I have not seen discussed is the flap (yellow outlined in the attached photos) clearly seen in the photos.
A Velcro edge, perpendicular to the flap, is clearly visible. This would completely hide the helmet wearers face once the Velcro was secured inside the lower edge of the helmet.
Is this old news on a thread I have not found yet?