The phrase "long frocks" refers to dresses or garments that are long in length, usually reaching below the knee or all the way to the floor. Full definition
They can wear the loose flowing wedding wear like long frocks with choridars, lehnga or gharas or maxi dresses. (outfittrends.com)
Deepak Perwani exhibited his hot off the press bridal / wedding wear formal outfits such as bridal suits, Georgette, chiffon, Crinkle stuffed fancy and embroidery work dresses, white silver color lehengas paired with red Kurtis, anarkali umbrella style long frocks, brilliantly adorned maxis, dazzling bridal gowns and many more. (stylesgap.com)
Western women including American, Sri Lankan, European wear short length frocks with tights and jeans during the Asian women mostly wear long frock dresses. (stylesgap.com)