The new button-down staple we all need for spring is the skirt kind. It has a cool retro spirit, echoing the '70s vibes on the runways, but the flattering, A-line cut keeps it looking thoroughly modern and fresh. My favorites include this supple suede Theory (also in navy), this denim H&M or this Stella McCartney, this black Topshop, this sleek leather Alexander Wang, this white pencil Current/Elliott, this faded denim Moschino and this mini Esprit.