Do you want to carry a gun or do you want to dress like a 13 year old? Okay maybe that is harsh, but my point is this, compromises must be made. You have to give up something shootability, capacity, or the Speedo something must go.
To slim and lighten the load think single stack mags. Walther PPS, Kahr Arms, SIG P-232, P-238, P-239, P-225 / P-6, and P-220, Ruger LCP, LC9, come to mind. Kahr has forgotten more about this market than the others have ever learned, jmho. The SIGs tend towards porky but more shootable. I have always thought the Walther to be quite interesting, a bit spendy perhaps. The Rugers are well, Rugers.
Don't over look a 1911 design, the flatness goes a long way, and who doesn't look like Thomas Magnum, sporting the shorts with a 1911 tucked in the waistband, a Hawaiian shirt covering the butt. Dude, everyone will be looking at your HAWT girlfriend anyway.