Holy irrelevant answer, Batman! The question was fielded about carrying a .45 ACP revolver and three people chime in about carrying .45 automatics.
A friend carries a Smith & Wesson Model 625 Model of 1989 3-inch on occasion. He regularly wears sport coats and suit coats. It's an awfully good revolver, sweet shooting in double-action mode and competition accurate if one uses it in single-action mode like an old time bulls-eye match shooter. I ought to invest in either a .44 Special or .45 ACP revolver for carry purposes and a proper holster rig to conceal it.
Here's his revolver, shown at the range with a couple of others. The top revolver, in stainless steel.
It would be instructive to read about the holsters folks are using to conceal their big N-Frame revolvers.