I'm sure it comes with the glass case. Just break the glass when you want to wear it. You won't need the glass case again as its so fragile you can only wear it once.
Good one! Let's see them make some shoot packs out of this fragile expensive material. I'm guessing a jacket made of dragon silk would not have to hide behind highly secured glass. Bet UA is thinking the same thing. Wild speculation on my part of course. :-)