My observations:
If the tip of the holster is showing, your shirt is too short or you need to change your concealment technique.
I advised my 14 year old son to do the following:
- try not to discuss Gun Issues at school or around friends
- never discuss my having a weapon in public, period - especially in a crisis situation (don't bring attention to us or the possibility that I am armed) ("Dad, where is your gun? Shouldn't you use it?")
- made sure he is no longer afraid of firearms (he has now shot most of my weapons a number of times), thus significantly changing his stance on the issue (was very anti-gun, as he lives with his Mom and tends to parrot her beliefs though this has changed as he ages)