Alessandro Dell’Acqua said his fall collection for No. 21 was inspired by Nineties grunge, but the result was anything but disheveled. The designer fused British influences with a hefty dose of Italian glamour, making for a savvy study in contrasts. He opened with a tartan-patterned mohair sweater, worn with a flannel shirt and a pencil skirt encrusted with flower-shaped sequins and ruby Swarovski Elements. Further riffs on Dell’Acqua’s signature masculine-feminine aesthetic included rockabilly drainpipe pants — cropped to show off Michael Jackson-style crystal-studded socks — and cocoon coats, which came in sculptural white taffeta or a striped knit bonded with Neoprene.