SHANGHAI (Reuters) - Hemlines are a little longer at this years annual online gaming fair in Shanghai, as companies take to heart a government directive against vulgarity, a Chinese newspaper reported on Friday. The ChinaJoy Expo, an annual online game showcase, is well-known for its spicy girls who dress up in hot pants and bras to dance and pose at company booths. But a recent government crackdown on vulgarity in the online games sector is forcing the girls to cover up, the Shanghai Daily said.