I OWB carry in a leather holster. According to Marshall Luton, with a leather holster the leather offers all the retention you need without extra retention devices. For those who don't know who Marshall is http://tdsatulsa.com/instructors.php
Impressive, but hes still teaching .mil and LEO
What about us ornery run of the mill civvies
To the OP my retention is ..my shirt.. ;O .... loveyalmeanit