“Project Runway” alum Michael Costello didn’t shy away from sexy, whether it was one of his nude mesh-paneled gowns, jersey cutout dresses or fitted, slit-up-to-there satin numbers. What didn’t work as well was the overabundance of architectural ruffles at the waist and hips. It was a good element when kept in check, but looked too cumbersome on some of his gowns.