Rockstar
If a slash-proof T-shirt that protects you from knife attacks is not secure enough for you (and I must say that it really lacked style), the Defender Hoodie might be a good alternative.

It is a hoodie with 2mm of Type IIA bulletproofing that is strong enough to stop a 9mm full-metal-jacket round at a velocity of 1,090 feet-per-second.

Protection doesn't come cheap though, the defender hoodie sells for $600. But if you live in a dangerous neighborhood, it might be a worthwhile investment.