Miuccia Prada further mined her twisted fifties vision for Miu Miu that, for spring, borrowed from John Waters’ dark comedy Female Trouble. The soundtrack, which included the film’s theme song, confirmed as much. Prada sent out garishly frilly yet finely polished pencil skirts; snug sweaters with daring décolletage; lots of exposed midriff; capri pants with contrasting belts; plaids pushed into new terrain; alt-opera leather overcoats; the occasional sizzle of acid blue; and heels with big good-girl ribbons on them. Here are the best looks…