Anyone have experience with the concealed carry undershirts?

I carry a 43 (iwb) typically or a 238 (ankle) when I’m dressing fancy. I’ve been looking at the undershirts with the compression pockets. Do they hold securely? Do they hold up at all over time? Figure it would be a much accessible spot than my leg. via /r/CCW http://ift.tt/2E9JAPp