A Walther PP series handgun is dead weight. For a pistol in that caliber go with a modern design like a Kel-Tec P3AT or Ruger LCP.
Like I said, I carry a fullsize service pistol day in and day out. I use my GLOCK 22 both on and off duty as a cop and as a private citizen. Carrying a service pistol is easy. You dress around the gun, not the other way around.
I am able to ccw my six inch S&W 686 .357 Magnum and all I wear are shorts, t shirt, and a pair of flipflops.