Personally I have found that all of the IWB or tuckable holsters are not all that comfortable.
You need a small light gun for comfort with any of them,
Tuckables are very slow to draw, and require adjustment which may give tham away defeating their purpose.
IWB's are OK but as I said not all that comfortable. You need a good belt also VERY VERY VERY important.
Desantis makes a good leather belt for a reasonable price (under $100, I paid about $70 for mine). I also realy like my Wilderness instructor belt (1.5") model.
My milt sparks watch 6 is a good holster for an OACP, the biggest gun I can cary IWB and sit with.
Desantis Insider is a good holster as well.
The best deep concealment which is fastest to draw with the right gun and practice is a good pocket holster in pants with BIG Pockets, and a baggy fit or pleat front.
Glock g-26 in Desantis nemisis is the biggest gun I can carry in a pocket.
You may want to consider new pants, test the pockets, and you may want to ask your dry cleaner / tailor to sew you custom pockets for some pants if you need to wear wool dress or suit pants.
I'm 5' 11" and I weigh 190, so Im a skinny guy, no dunlaps thanks.