By any normal standards, Oak wine bar shouldn’t be on Oak Street. On a funky commercial strip, this cavernous space painted in pristine shades of white and beige exudes urban cool. In an area not far from two universities, where most fashion statements are spelled out on T-shirts, at Oak the couples and groups of young ladies show up sporting the best outfit from their closets. At most of the surrounding bars, calling for anything nicer than a Bud or Abita would be putting on airs. But at Oak, the wine list is extensive and unexpected and the cocktails are cheeky contemporary inventions with names like the Edith Piaf (pisco, white wine, and muddled grapes) or the Satchmo (bourbon, Peychaud’s bitters, and orange).