Betsey Johnson transformed her Seventh Avenue showroom into a Fifties malt shop and served up some of her favorite recipes: pouf skirts, corsets, classic rose prints and plenty of sequins. What looked fresh was a knit ensemble; a cropped cable-knit sweater and satin corset over a pointelle skirt that ballooned over a crinoline, as well as some graphic color-blocked sweaters à la the Eighties. Yes, there’s an appetite for Johnson’s sense of fashion fun — she will be partnering with Opening Ceremony for a reissue of past hits.