I'm 5'8" and about 165 lbs. I don't care for loose, "relaxed fit" clothing and that can make concealing a Glock 19 a bit harder.
Pictured above: Glock 42 and extra magazine in a Custom Carry Concepts Looper AIWB holster and pouch, respectively. Clinch Pick in Dark Star Gear sheath, Spyderco P'Kal, and SureFire EB1 Backup.
I can get away with the above even with slim chinos and a medium polo shirt. Note: I don't "normally" carry AIWB but I reserve it as an option.