WANTED TO WRITE something snarky about Moira Johnston because what she's doing kind of begs for snarkiness. But after hanging with her in Rittenhouse Square - where her bare breasts caught the morning sun, elicited picture-taking and drew a blasting honk from a Roadway Express truck - Johnston won me over to her cause. Which is this: Women should be allowed to go topless anywhere that men are allowed to. Maybe it was the flowered pasties that covered Johnston's nipples. Or the glorious breeze. Or the guy who grinned at Johnston's chest and said, "God bless ya, babe!" Mostly, though,...