These days, in high tech applications, they stitch together the layers of cloth in composite layups to obtain even more strength. You could make a sort of "quilt" of fiberglass, which might make cloth handling easier later on, depending on how much care goes into the blanket.

> Don't confuse Kevlar 49 (used for lamination) with Kevlar 29
> (a fabric used for ballistic strength). They have MUCH different properties
> and purposes, and neither is a substiute for the other.

> Kevlar 49 is used with epoxy, vinylester, or polyester resins
> in traditional wet lay-up or vacuum-molding techniques for solid or
> sandwich constructions. It can produce laminates 10-30% lighter than
> equivalent all-fiberglass layups, but must be properly designed and
> fabricated to take advantages of it's unique properties.

> Kevlar 29 is a fabric, not designed to be used in a general-purpose
> laminate. It is sewn into multi-layer "laminates", but not
> impregnated. I don't profess to know or understand the physics of
> how it provides ballistic strength, but suffice it to say it works
> wonders in bulletproof vests, chainsaw "chaps", splinter
> and fragmentation containment "armor", etc. But, it is not
> intended as a lamination material, except as a replacemnt for mat
> to form solid cores in such things as boat hulls.