MIAMI -- Lilly Pulitzer, a Palm Beach socialite turned designer whose tropical print dresses became a sensation in the 1960s and later a fashion classic, died Sunday. She was 81.Mrs. Pulitzer, who married into the famous newspaper family, got her start in fashion by spilling orange juice on her clothes. A rich housewife with time to spare and a husband who owned orange groves, she opened a juice stand in 1959 and asked her seamstress to make dresses in colorful prints that would camouflage fruit stains.The dresses hung on a pipe behind her juice stand and soon outsold her drinks. The company's dresses, developed with the help of partner Laura Robbins, a former fashion editor, soon caught on.The signature Lilly palette features tongue-in-cheek jungle and floral prints in blues, pinks, light greens, yellow and orange -- the colors of a Florida vacation.The line of dresses that bore her name was later expanded to swimsuits, country club attire, children's clothing, a home collection and a limited selection of menswear.Changing tastes brought trouble. Mrs. Pulitzer closed her original company in the mid-1980s after filing for Chapter 11 bankruptcy. The label was revived about a decade later after being acquired by Pennsylvania-based Sugartown Worldwide; Mrs. Pulitzer was only marginally involved in the new business but continued reviewing new prints.