If its a pain in the butt, don't sit on it. Seriously, there are nerves coming out the lower spine you don't want to mess with.
Unless you're concealing with a t shirt, printing should not be a problem. Look around how many little lumps you see from cell phones, guns, whatever, nobody cares.
Even a OWB at 3-4 o'clock disappears under an ordinary Dickie's work shirt.

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Science plus Art