A fit and flare knee length dress for cocktail is playful because the silhouette is fitted through the bodice then flares from the waist. Knee length shows the flare fully and creates movement. The fitted bodice might be structured with darts or seaming or it might be just fitted knit that hugs naturally. The flare is the design feature. This silhouette works in solid color or print. The fabric is usually cotton or cotton blend with enough body to hold the flare without sagging. The neckline and sleeve treatment are important because the bodice is close fitting. A good fit and flare dress makes you feel put together. These fit and flare knee length dresses work because the proportion is flattering and the silhouette is inherently considerate.