I used a Clinger Atom at a wedding. https://clingerholsters.com/product/atom-clinger-holster/ White t-shirt under a polo shirt. Everything tucked in and nobody knew it. Had khakis on with a 5.11 dress belt. About 5'8" 165 lbs. Worked for me. Carry a G19 every day with the same setup also.
Bob
Bob