Tea-stained ivory skirt suits, bias-cut anemone-print chiffon dresses, and stretch, tropical wool suiting with a 1940s feel was where Posen’s idea of dressing with ease came into play. One slate-gray sheath, equipped with a convertible collar that could be folded over and pulled low down to the elbows or left to drape like a cowl neck, proved that easy can be whatever you make of it.