The only CCW's I've ever noticed were those on motorcycles during the summer, flying down the highway, the air blows their shirt half-way up their back exposing their CCW's fully.
Then when I was buying my motorcycle, the owner made a customer leave the store to leave his weapon in his car before she'd let him in and had her hand on her CCW during that entire encounter. After he came back in they exchanged apologies and he went about shopping. I never saw it on him. Guess she'd been there, done that before enough to make her wary.