Zac Posen may be busy augmenting his ZAC diffusion line with additions like fine jewelry and eyewear (both launching this season), but far be it for the perfectionist designer to slack where clothes are concerned. For Pre-Fall he flirted with Latin American aesthetics and Frida Kahlo, eschewing the downright crafty in favor of pieces like a short-sleeved, chunky sweater in green and blue, or tweeds that dissolved into multihued fringe. One grouping, created in collaboration with sustainable brand Piece & Co., saw handloomed Ecuadorian fabrics integrated into Posen’s vocab with surprising ease. Their exquisitely riotous colors played well with classic silhouettes like a sweet cropped jacket and a swingy top. Across the board, handkerchief hems, trapeze shapes, and capelet details lent this offering a sense of fun that is sometimes missing in Posen’s ZAC line; sumptuous silk faille and lambskin fabrications kept the tenor of luxury. Best of all was a tangerine and rose evening gown whose neckline came decked out in raffia flowers. It had a certain Vreeland-esque joie de vivre that was particularly nice to see.