I used to wear a neck knife. I had it on one day under my shirt, picked up a 50lb bag of ingredients at work, brought the bag to my chest to carry it to the hopper I was going to throw it in. When the bag hit my chest it hit the neck knife which came unsheathed, turned sideways, cut a hole through my shirt and hit the floor. Kinda scared me so I quit carrying it. To be fair it was a cheap chinese knife, probably wouldn't have that problem with a quality sheath.
Besides, I usually like a bigger knife than what I would want to carry around my neck anyway.
Besides, I usually like a bigger knife than what I would want to carry around my neck anyway.