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I really should have begun that post with, "I'm sorry this whole ordeal happened to you and here's a suggestion that I hope helps prevent something like this happening again". Please don't think I'm making light of the awfull situation - your story scares the heck out me really.
So with that out of the way, instead of a sock how about a hand puppet? Or an oven mit?
Wait, I've got it - a skintone matching glove. Then they'll just think you've got a hand growing out of your hip.
You could get a matching one for your other side! I'd love to hear that 911 call.

FWIW, here's a little trick I'd like to share.
Take the fabric of your shirt that hangs about 2 inches below your beltline. Pull the clip(s) of your holster away from your body and stuff/slide the fabric between your belt and the holster clip(s). Push the clip(s) back, and the fabric will be "secured". Now you can reach that elusive item on the top shelf, (or for the sky) and (if your shirt is long enough) the holster clip(s) will hold the fabric from raising up. To draw you'll have to yank down on the bottom of your shirt and the fabric will pop right out. You will have to grab the bottom of your shirt to get to your gun anyway.
I'm going to start calling it the "handog" technique (with your permission handog).
Or you could just place a sock over the grip and folks will just think you've got a real bad static cling issue.