Give it an Elvis sneer. That'll show them. [ROFL3]
Glock 19 is a pretty common, so just about any decent brand name holster will work with a good quality belt. Over time, you will spend lots of money on different holsters till you find what works for you. Then you will change your mind or your body will change and you will need to find another holster solution. I personally always carry in the same place. I carry concealed because I'm no longer in uniform. Concealed means less emphasis on retention but requires some additional manipulation to clear your cover garments.

