Guests arriving at Martine Sitbon’s Rue du Mail show were met with flutes of champagne and exited to thumping dance music and a spinning disco ball. On the runway, that party spirit took on an edgier, rocker spin, with a soupçon of futurism thrown in. In the designer’s hands, for example, paillette embellishments on jackets and dresses were rendered armor-like, turning her girls into warrior chicks. And she put touches of silver and gunmetal hues into the mostly black palette for an added industrial patina on boy shorts and an asymmetrically draped dress. In fact, urban protection seemed to be the season’s theme, the best examples of which came in on the softer side. Sitbon’s cozy, swaddling knits — as in sweaters with lush, voluminous turtlenecks, for instance — were excellent. Not so, however, the collage motif that closed the show — a patchwork of sequins, metallics, prints and more all in one outfit for a look that read more puzzling constructivist than chic.