Found a few interesting pictures of museum pieces while doing some more research:
Fauld clasp, and seems to be a half "mail brayette", too
This one, I'm a little suspect ... I don't know if the pieces were originally together, but if so, interesting to note the size of the neck opening since the mantle of the coif covers so much area too. Why this style instead of the hauberk with integral coif? I don't know...
Two shots of the same thing - the neck clasps. Am I looking at this right? It looks like there's actually a buckle on each side of the collar. I'm thinking that a single leather strap would go through both of the buckles, to keep the collar upright/closed. Thoughts??
Another neck clasp.
Just a good picture showing a single garment of multiple-sized rings - small, tightly woven rings of a mail mantle/standard. The small, tightly spaced rings give it some rigidity, and was somewhat of a precursor to plate, sacrificing the flexibility and taking more weight and better protection instead.