Oh... in the shop only...if I worked with knives, I'd try and have a thin stainless sheet on the back of my apron covering the entire torso. A thick Kevlar sheeting would be better. Just in case a piece of blade decided to break off and come flying into me. In the end, to be certain, one may need to look like a Borg drone wearing a bike helmet, but every little bit helps. Occupational hazards; knife making would have its fair share.
But I've seen accidents occur in numerous metal fabrication workshops in my time that would freak you out. Even a fatality with a MIG gun. A newbie was training and wanted to check if there was any airflow coming through the gun's nozzle. The workshop had a fair bit of ambient noise coming from other power tools and MIG welders being used at the time. Normally one places the gun at an angle pointing AWAY from one's face/head and listens for the gushing insulate gas coming out. The newbie without realizing, points the friggen gun STRAIGHT into his ear and presses the trigger. Over two feet of 1.2mm thick mild steel wire was removed from within the kid's brains during the autopsy causing a near instant death when it happened. There were over a hundred people in the Royal Melbourne Institute of Technology welding dept's workshop when in happened about 25 years ago. I was there doing some consulting on a robotics device they were trying to build. NOT A GOOD DAY that's for sure. It was also found that the kid had been smoking the funny herb during lunch break, just before he came in and it happened, it was detected in his blood by the Coroner.
In metalwork, as in all aspects of life, and more so than in other lines of work, it can come at you when you least expect it. Being clear minded and focused at all times helps to prevent it. You only get one chance with metalwork, and sometimes, you don't get any.