Marc Jacobs’s Sept. 10 show for the signature line that bears his name was about rigidity – both in the pattern of his thick stripes and the silhouette of the dresses. On Sept. 12, he took his Marc by Marc collection about as far from those sharp lines as he could go. Patterns were heaped up patterns. Female models were wrapped in chic hausfrau headscarves, while male models sported newsboy caps. Was it a modern riff on post World War II-era British dress, or a nod to Dexy’s Midnight Runners and the 1980s pop scene? Perhaps an homage to grunge? With so much happening it was difficult to determine. But strip away those layers, and you’ll find an exceptionably fun summer wardrobe.