Kel-Tec P11 IWB everywhere...inexpensive, compact, lightweight (20 oz. with 10 rd mag and + 1 in the pipe), nice and ugly, but above all, very reliable.
I go back and forth between 9mm and 45 auto. I like the 45, but think I'm faster on follow up shots with the 9mm. It's usually 45 auto about 80% and 9mm about 20% with 380 100% as a BUG. The 380 pocket pistols now days carry so well in a pocket, that there is no reason to go anywhere without one.
I carry a Centennial. I don't have to worry about the hammer. It being Stainless makes it less of a maintenance problem. A bit heavy I'll admit to carry in my pocket.