for your particular needs you may benefit from a belly band or a concealment shirt (glockstore has both). I did not like the belly band because I need to be able to reholster one handed if needed. The concealment shirt (I have no first hand experience with) my friend has and swears by it. He works in the oil and gas industry on frac tanks and they are in some very secluded areas - just feels better knowing his firearm is under his left arm 12-18 hours at a time.
Texas DPS Certified CHL Instructor
Premium Handcrafted Leather Holster Maker