It's kind of bulky.*
... I wonder how much protection would afford an unnoticeably thin layer of solid Grief under our clothes.
Grief is preeeety tough, maybe even that thin a layer of Grief would be useful?
It depends on whether we can make it behave like a non-Newtonian fluid, so it's soft most of the time and hardens in response in impacts.
If not, then the main issue won't be the thickness, but the rigidity, which is a necessity for armor. Armor that was as this and flexible as cloth, no matter how indestructible, wouldn't provide any protection to the wearer.
(Yes, we can ignore such matters of physics, but only by using witchy magic, which makes all the meguca in the area freak out.)
Solid grief does seem to be pretty strong, so even a thin rigid plate could probably stop most threats. And we've got a unique advantage in being able to shape and size the plates very precisely to match the wearer's body (as opposed to the "standardized 10x12 slightly-curved rectangle" that most people have to settle for). Sabrina might even be able to reshape the plates subconsciously to match her movements, and her telekinetic control over Grief can make weight a non-issue.
And we could better hide any unsightly bulges the armor might produce if we ever buttoned up our longcoat.
Of course, the most vital thing to armor isn't any of our internal organs. It's our Soul Gem. Which is worn outside our coat in plain sight.
