
Asundress orsummer dress is aninformal or casualdress intended to be worn in warm weather, typically in a lightweightfabric, most commonlycotton, and usually loose-fitting. It is commonly abodice-stylesleeveless dress, typically with a wideneckline andthin shoulder straps, and may bebackless. A sundress is typically worn without a layering top and is not usually worn over a blouse, sweater, or t-shirt, or with leggings.
While the word "sundress" was first used in the early 1940s, they really came into vogue in the 1950s and were especially popularized byLilly Pulitzer in the 1960s.[1]

The sundress is considered by many people to be both more practical and more comfortable than other varieties of dresses, particularly in warm or hot weather.[citation needed]
Sundresses can be of anyneckline andhemline, ranging frommini to full length, though they are more often midi or maxi length. They are typically but not always, sleeveless and collarless, with a wide neckline and thin shoulder straps.[2]
Sundresses can use a variety of closure types, including backzippers, side zippers, frontbuttons, back buttons, back ties, pullover or other closure styles. They may also be without any closures or fasteners and put on over the head or slipped on by pulling up from below.[3] A lot of sundresses have patterns on them, the most common being a floral pattern.
Since the 1940s, a sundress-likeone-piece swimsuit appeared,[4] has come into use, though some now find it matronly or gaudy.[5]
Sundress is afuzzy concept, with various opinions on which traits are necessary and sufficient to the definition, including:[6]
Potentially overlapping types includeslip dress, day dress,shift dress,shirtdress,caftan,tube dress andnap dress.[6]
Swimsuits with skirts can either look matronly or costumey