Ever since I bought some "Smart Mass Thinking Putty" way back when, I've wondered whether a similar compound might be usable as body armor. To be sure, this wasn't the most obvious idea . . . in general the material acts like somewhat gooey silly putty, and when it doesn't act like silly putty it's because it's been torn or shattered.
However, the basic idea was to have a material that would bend and flow but, in the event of impact, would act like Kevlar plating.
Well, we're not quite there yet, but we're close.
Add this to the list of things that would look goofy on televised sci-fi ("Behold my impenetrable jello armor!") but are actually workable.