“Clean drama. No ruffles, no flounces — everything has a reason and a purpose.” That’s how Zac Posen described his collection backstage after the show and, indeed, he demonstrated a restrained hand for fall.

Simple and unadorned, the streamlined daywear included chic skirt suits with slightly pronounced shoulders and nipped waists, some with skirts in subtle A-line shapes and triangular seaming.

Even much of Posen’s eveningwear looked uncomplicated — the winner was a black column with a round strapless neckline. He of course turned up the volume with some exits — this is Zac, after all — delivering several ample ballgowns, all of them embellishment-free. A silk taffeta number in smoky blue with a mock neck made a major statement, as did a red strapless style with sweetheart neckline and supersize skirt.

Chic by day, drama by night — the collection was one of Posen’s best yet.