I carry a full sized 9mm (fnx9 17 round mag) in a cross breed super tuck holster. Carry it at about 4 oclock and it covers just fine with just a Tshirt. Im fairly slim though so my shirts hang from my shoulders leaving my clothes looser at my waist. I would recommend a good belt, when I was carrying it daily normal belts only last about a month if lucky.

I don't tuck my shirts in when I carry my 9mm but practice practice practice drawing how ever you where yours.

And use someone else to tell if your gun is showing. Its probably never going to stop printing in your eyes because you know EXACTLY where it is. And even if it does print... its very unlikely that anyone will notice. Ive had the wind blow hard enough that you could clearly see the grip, hammer, and rear sites sticking above my belt through my shirt and no one even looked twice.