Get yourself a .9 mm glock and carry it in the small of your back, there are holsters for this, you'll have to wear a jacket or some kind of jersey (even a loose t-shirt should do).
that's probably the best place you can use, a shoulder holster will call for you to use an open jacket of some kind at all times.
An ankle holster is good for your backup weapon, but not at a grasp for your main...
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