Carhartt makes a popular work jacket, but this story certainly does add to Carhartt's already good reputation. NYPD checking ammo after knifeman’s jacket stops cops’ bullets.
Chris Baker at Luckygunner.com did a comparison of handgun ammo last year, and he said the FBI standard for bullet penetration into ballistics gel was 12-18 inches. See Handgun Self-Defense Ammunition Ballistics Test for a review of his test results, which, by the way, included four layers of fabric.
Presumably, the NYPD uses one of the ammo brands tested, and they'll probably be doing their own testing soon. But whichever ammo they used, that Carhartt jacket sure held up well. I knew there was a reason to like them.
The nypost.com article didn't say how many total shots the NYPD fired, only that four bullets didn't penetrate the jacket. The good news is that only one bystander was struck, and she was only grazed. She'll probably be shopping for a new jacket soon. Might I suggest Carhartt.