I've been using a galco. single clip iwb at 4:30. Shirt untucked its completely undetectable. Shirt tucked in it, shirt tail goes between clip and leather and stays 98% concealed, but anyone looking will notice a single black clip. It wasn't the most comfortable the first few weeks I used it but after it broke in it became less painful LC9 should be very easy to keep covered. You may also be able to get a pocket holster and just pocket carry it. I switch between pocket carry and iwb depending on dress and on the bike I almost always pocket carry. I've always been afraid it will pop out of an iwb. Personally I've never been a fan of the PDA type holsters because no one uses them anymore and they kind of stick out like a sore thumb.