Yes, from what I understand from closely looking at the DICE 3D scan of the helmet, the brim is two pieces of fabric stitched at the edge of the brim and the leather ear covers are attached as below. I've made templates directly from the scan for both of those parts and working on the ribbed portion but can't figure out how it was attached (the 3D model obviously doesn't show the inside of the helmet), as well as this it's missing the "skirt" you speak of as its of a background helmet not a Hero.
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I'll admit this project has been on the backburner for the past few months as I've been working on another helmet. Very keen to get back into it within the next few months though.
Hopefully RS can hurry up with their replica and figure out the missing pieces of the puzzle for me lol.