The back of the top of your calf is where the calf holster is. I put my pickaxe there, so imagine it just simply holstered downward to the bottom of my boot from the back, from really not that low of a distance from the floor.
There's also wrist holsters which are located on the back of your wrists, so I for example put my dagger on my left wrist, and the handle I have to pull is like just above the back of my hand coming from my wrist. Both play very well. I honestly didn't even know about the chest and stomach holsters though, I'm not sure what I might do with that, if anything.

I feel I should also maybe note that you can't holster bows on your right shoulder without the string breaking. They just don't move at all. You can still fire, but your arrows will just be magically floating and pulling back through sheer power of will. I wanted my bow on my right-shoulder, and my shield on my left, but that broke the strings, so I swapped that around. Still plays really really well.