The fabric of floral pattern dress is 95% Polyester 5% Spandex, the fabric of solid dress is 95% Cotton 5% Spandex. The middle knot is just decorative, you can make a pretty bow via the separate tie, and the buttons are NOT funtionalComfy and soft material, lightweight and breathable, an classy adorable summer sundress in your wardrobeFeature: Chic and fashion tie front design, adjustable spaghetti strap, deep v-neck, beautiful patterned print,leopard print,adorable button decors, hawaiian beach sundresses pockets, sleeveless sun dress, midi knee lenghth. makes you elegant and sexyThe style of the summer swing dress so sweet, you can easily pair your favorite high heels or sandals, enjoy your cool summer daysSuitable for vacation, beach, party, cotillion, quinceanera, prom, luau, wedding, homecoming, holiday, cruise, outdoor, cocktail, birthday, dating, evening, bridal shower, baby shower, daily casual wear. This casual dress is great for spring, summer