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Last time I was in this situation it was a "casual business attire" sort of place, i.e. dress shirt tucked in but no coat or tie. I carried in a Confidant shirt from Kramer Leather and secured my handgun in my console while I was inside.

The Confidant was comfortable, very discreet, and lasted through four or five years of every-business-day wear.

It helps if you can use a sewing machine well enough to fit the elastic holster to your firearm. (Or know someone who can.)