Hemlines mostly fell somewhere between mini and microscopic on Marc Jacobs’ abbreviated dresses. They came in colorful sequins, ruched satin and sheer netted black guipure, almost all styled with sheer black stockings and festive footwear — sequined python scrunched boots, anyone? At the risk of stating the obvious, “It’s a party,” is how Joseph Carter, Marc Jacobs’ head of women’s design, described the lineup, presented for the first time as a mini show at Manhattan’s Academy Mansion. “It’s punchy, something a little gaudy.” Gaudy in a good way, such as the halter dress with a giant bejeweled choker neckline, and the black-and-white “bunny fur” jacket with a bow. There were notes of Sixties swing, Seventies Saint Laurent and Eighties party punk, all united by Jacobs’ witty attitude of girly irreverence.