It feels like Joni Mitchell is in the air. After the blizzard of attention lavished on Kate Bush this year, it may just be Our Lady of the Canyon’s turn for some love. And even if Alberta Ferretti might not have been 100 percent clued in to such a notion, she certainly offered up outfits that would’ve been the stuff of fantasy for Joni and the other ethereal L.A. spirits of the late ’60s and early ’70s. Look no further than a white mousseline gown, appliquéd with feathers, draped in a whipstitched suede gilet with fringes trailing to the floor. The accompanying shoes were hippie sandals, crocheted moccasins, or the Diana the Huntress gladiators that are everyone’s favorite this season.