I've never went the tuckable way. I've been packing either a full size Springer or Colt Commander since 93 amost daily. Packed my snub 66 for awhile IWB but the 1911 gitters kicked in. Have never been made carrying IWB with either a HBE Leatherworks, TT Gunleather or Lobo holster. All quality rigs. It's all hoster, a quality belt and the right outergarmet. If you go single clip I'd go with an offset one, so the clip doesn't bulge out from being over the cylinder. I really do prefer two clips for max concealment, comfort and keeping the weapon in place. JMO.
For summertime I've went with Columbia PFG shirts as they let you stay cool and do a great job covering it up. Wintertime I usually wear a sweat shirt, both a little on the baggy side.