Over the years I’ve gotten a pretty good handle on the proper combination of clothing to keep my concealed concealed. I still struggle with #4 - a “good” holster. Holster manufacturers love me because I buy their stuff and then reject it (and turn around and buy something else).
Having lost one sidearm in the middle of a busy street during a foot chase I’m cautious (maybe even paranoid) about having a holster that actually secures the weapon. Now it’s easy to get one that emphasizes secure containment - but they all come at the expense of concealment.
I have yet to find the happy medium.