Forty years ago, Greta Casey would have been a go-go goddess in a Russ Meyer picture: a strapping Amazon in thigh-high boots and straining halter, breaking men’s hearts (and if need be, their necks). Today, the former New Yorker gets her kicks as a “sign girl” in “Katy K” Kattelman’s popular retro-burlesque revues. As sign girl, the ultravixen known as Gorgeous Greta sashays across the stage with cards announcing the next act. The gimmick is, she’s wearing one less article of clothing each time. By show’s end, a man would crawl across slivered glass just to trace one of her barely concealed tattoos with his trembling fingertips. It’s a switch from Greta’s day gig at Katy K’s 12South emporium of hip threads and novelties, where the former restaurateur greets customers behind the counter. Even there, though, her raven-haired presence rivals a nearby poster of Nashville pin-up icon Betty Page. One flick of that kitten’s whip and we’d be goners. Faster, pussycat! Kill! Kill!