Duchess of Edinburgh Sophie just made a strong case for the shirt dress as the ultimate summer-to-fall staple. She wore a long-sleeve Emilia Wickstead design to a recent Buckingham Palace garden party, reminding Us how versatile the silhouette is. With its button-down front, defined waist and longer hemline, it's the kind of dress you can wear with sandals in the summer and with boots or a light jacket in the fall. And there's an under-$60 Amazon option that captures a similar look. Enter the Milumia Summer Flowy Maxi Dress.