My holster is a Crossbreed Supertuck, using velcro clips (so they cannot be seen at all), and a good belt from Comp-Tac. The belt has the soft side of the velcro all around the inside, so the holster fits well. Once I put it on, it doesn't move a single bit - and I carry a full-size Sig 2022, with an extra 2-round extension on the bottom of the mag.
That not moving part is important. Less movement means less adjusting and checking, which means that less attention is drawn to your waistline in general.
Most people won't notice anything. In the rare instance that someone may notice, most of us have a few rehearsed lines in case anyone ever asks if we have a gun on our hip:
- "No, it's a cell phone holder"
- "No, it's an insulin pump" (people rarely continue to pry about medical items)
- "No, it's a colostomy bag" (same as above - but even more a conversation-killer)
- "No, it's an emergency ventilator" (same as above, but actually true this time, because if you ever had to use it, you'd be ventilating your attacker)