I carry my GLOCK 27 (yano, the "brick") both concealed and openly in an outside the waistband holster; the
Blackhawk Serpa CQC. Now, I have a decently heavy frame at 5'10" and 235 lbs, but I can conceal comfortably with just a light overshirt (a "Hawaiian shirt" will do) and have done so in not just basic areas, but also with a group of people watching me work on a chalkboard reaching with my strong-side.
Definitely take a look at it and see if it's something you'd be interested in. The locking lever is one of the features I absolutely love, as it makes it secure and easy to use, but also cuts down on the size and the "print" due to material around the firearm that you'd find on a leather holster.