Doesn't work. Carbon fiber is not bulletproof, and kevlar is pretty dogshit compared to other materials. The main advantage is weight and concealability, at the cost of performance; it's a huge tradeoff that frankly isn't worth it in the vast majority of use cases unless you really really don't want people to know you're wearing armor. If you were planning on going full Ned Kelly, there's really no beating steel. The highest tier body armor, i.e. capable of stopping high caliber AP rounds, is all ceramic, but this comes with a massive asterisk because ceramic works by intentionally crumpling and "catching" the round rather than deflecting it, which means it's only guaranteed to work once. Steel will deflect rounds repeatedly and reliably, and it scales with thickness; the only reason there aren't tier IV steel core plates is because they'd weigh like 15-30lbs each, so a vest with minimal coverage would be 30+lbs, which is fucking nothing if you lift but the majority of boogaloo preppers are big fat fucks or scrawny bugmen who can't handle a steel frame handgun without losing their breath so it's not marketable and thus not marketed.
Carbon fiber isn't magic, it's basically just a chain link fence, and like a chain link fence the goal isn't to provide superior structural integrity but rather to provide adequate structural integrity at a lower weight and lower cost. You're legitimately better off making DIY plating out of welding blankets or milk jugs, look it up on youtube. But there's no replacement for solid steel.
I would be really interested to see how metal lattice structures perform in ballistic tests but that's NASA shit, it wouldn't be economically feasible to bring that to production.