I wear mine down around my hips where it is basically in the same position as an inside the waist band. It's great for wearing sweats white jogging, for me anyway.
I got mine on Amazon for less than 15 bucks a while back. I use it walking the dog and will probably use more as it gets warmer. It was cheap, covers the trigger, and everyone isn't staring at my gun. All around it has been a good deal.
I doubt he forgot where it was really. When I read the story I figured he probably forgot to grab it before he left the day he resigned and had yet to figure out how to get back into the classroom,and into the ceiling tiles, without having to admit he brought his gun to class. Probably waiting...
It's not the easiest to do but I like to put the kids in, shut the door, and then lean over the seat to buckle them in with the car doors shut and locked. Hurts my back but if I'm feeling a bad vibe I'll manage it.
When walking in a dark parking lot I used to place my longest key sticking out...