GSG -
Just to let you know, Bogie had his satire button engaged.
I have an XD - similar to a Glock. I prefer a leather holster (Galco Concealable type) that holds the gun closer to my body than the Kydex type. I wear an XL T-shirt (normally wear L) and then throw a " Camp" shirt or Hawiian shirt over top unbuttoned. I have yet to be made.
+1 on patterned shirt, they help immensely to break up any printing.