Untucked shirts aren't exactly 'professional'...
I do have jeans that I can do an IWB and tuck the shirt around it, but even with cant you can still often see either the butt or the top sight poking out. The best I have come up with so far is a shoulder holster under my shirt and on my thicker shirts it works fairly well. (Wrangler pearl snap 'work' shirts generally) (this is Texas afterall, that IS considered 'professional')
Also, as tall as I am, I would have to buy really REALLY long shirts (finding the regular 'tall' shirts is hard enough!) to cover a gun on my hip.
The point isn't 'how can I cc' The point IS that it would be much easier to OC and that the whole 'People will be scared to see people wandering around with a gun on their hip...' Which means that this pic on my FB page ought to be scaring people left and right, yet, nobody (other than DK) seems to have even noticed!