If you are fortunate enough to be able to read the gun magazines from the 50s on, up through the 80s, you will find many articles talking about concealing autos vs. revolvers. You can find them still today, but no where near the frequency of decades past when revolvers were the main choice.
And an interesting thing you can find in these kinds of articles, both the "obsolete" clothing, (and criteria) and the fact that barrel length was not the biggest factor.
For a revolver, it was (and still is) the cylinder. For autopistols, its the butt. And what concealed easily under the looser styles of the past doesn't do as well with form fitting attire.
Not sure how well "obsolete" fits, but by the numbers, revolvers aren't as popular as they once were. And while I'm about as far from fashion aware as you can get, even I know that today's suits aren't cut like the ones from the 1930s.
Fit your gun to your wardrobe, or fit you wardrobe to your gun, I don't really see another option..