A great neutral dress is a necessity in any woman’s closet, especially at a time like this, when the seasons are transitioning and you need a non-partisan garment. A shirtdress does the trick every time. Throw a bevy of bright floral accessories onto it and — voilá! — you’re a spring sensation. Slide a gray cashmere sweater on top with knee-high boots and you’re all fall. Take a look at the three shirtdresses we’ve selected.