Acknowledging the fact that Resort is the collection that lingers longest on store rails, Dior’s latest managed a clear, clean arc from city smart to holiday luxe. The former featured neutrals made graphic with geometric banding and structured silhouettes, like the black and beige coat in double-faced wool, or the classic Bar jacket updated with a little pleated skirt. The latter was summed up by a caftan in cobalt blue mousseline, with a bodice encrusted with embroidery. That blue, along with coral, helped create a summer-in-Portofino vibe. If a resort could claim royalties for atmosphere theft, Portofino would surely be that place this season, and Slim Aarons could stake a claim too, because his photographs of the monied at play have been equally influential.