The Galco Combat Master @FLA45fan suggests is a good choice.
Alot of the handmade to order holsters made by craftsmen are over engineered and unnecessarily thick and heavy.
I ve bought a few for my GP100, which is a heavy handgun.
After spending alnost $400 on 3 different holsters I did not like, I bought a $46 DeSantis thumb break Scabbard on a suggestion.
I could not be more happy.
Its thick and sturdy without having extra bulk. It carries my heavy revolver very close and tight to my side. I carry it all summer with just a T-shirt and shorts with zero issues.
I know they make one for the Colt Officer size. They also make them without the thumb break.