No intent to insult...In fact, I believe you to be among the most, if not the most, forward thinking of the gear creators working on ultralight ideas.
While serapes have certainly been around for centuries, I don't know of an insulated quilt or bag that incorporated the resealable head hole in the middle before the No Sniveller... Which, FTR, was a design request by Sgt Rock in a survey on under qulit designs almost 3 years ago on Whiteblaze.net.
Also while I recognise that you are probably fully aware of the nomenclature, location and costs of "no snag velcro", I am also aware that frequently this forum generates second and third order questions by monitoring readers on the sounces, cost etc. This data was include for general info as I've found that it heads off extra questions/posts.
Good luck on your project...it is interesting work