I was a cop in Vegas for a while and a lot of them tucked it in the front of their shirt on the button seam, clip on the outside. When you wear your mic on the front of your shirt it hides it easily. I've carried it off duty like that down lower near my waistline in order to better conceal once in a while as well.
I do front right as I'm right handed and it's always on me, whether I'm at work or not. I'm pushing the rules at work - we're not allowed to have weapons on premises. A Ken Onion Vapor should pass, but I'll worry about that if it happens. Haven't been challenged so far.
i usually carry one in my boot,which is a fixed blade coldsteel "braveheart". The braveheart is light and slim. Also one in my front right right pocket for everyday use. Here is a link Brave Heart : Boot and Neck Knives (Fixed Blade)