To tell you the truth, when I carried all the time I tried a number of holsters for my Glock 21. The best and most concelable I found was the Glock made sport utility holster, with a long shirt of jacket, out side the belt carried just behind the hip. But saying that I am a pretty good sized man, and I dress casual most of the time jeans , T shirt ect. Throwing on a denim long sleeved shirt, rolling the sleeves up and leaving it untucked got me by. Even when I was in a suit and tie I could wear the Glock holstered on my belt with little bulge but by haveing my suit coats let out wearing them open like a sports coat worked fine. A smaller person or someone who has to dress differantly would have a problem. Your carry pistol is a bit smaller in profile than my 21, you need to look into several holster designs and adapt them to how you normally dress. Try the C Tac that is a good all around design and will not break the bank account, Bianchii makes some that work out alright as well, as do several other makers. Stay away from the center of the back carry, I found that to be hard to access and it imprints when ou bend also it is a danger in a slip or fall since you land on the pistol, and them Glocks do not give. Shoulder rigs are also a danger and give themselves a way. I went on a drug raid with a new detective who had spent a good amount of cash on a new shoulder rig from a custom maker, we had to force entry he was last in line thankfully because when he pulled his 1911 it stick in his brand new high dollar rig he blew a .45 caliber hole in the back of his jacket and set the fabric on fire. No body wanted him on raid teams after that for some reason.
Lets see, cross draws , they are known as widowmakers for a reason, skip them all togeather. You wanted my opinion so here it is based on twenty years experiance as a working cop, [beeep], and field training officer. Don't try to get fancy, any IWB carried at a 3:00 or slightly behind the hip should work out fine. you will need to watch the way you dress when you carry it is called concealed for a reason, you should be the ONLY ONE TO KNOW! yea I know it is real keweell to have you buds all see the bulge but if they can see it then so can any one else, that limits the effectivness and can cause a lot of harm and needless problems.I have been retired for near ten years, I got a Retired LEO CCW when congress made it legal. but then let it lapse because I really do not need to any longer. But you younger guys who can get CCW great, I feel the more good, responsible folks who are armed, the better and safer we all are.