In function, it is considered the male equivalent of the women's "cheongsam" ("qipao"). Some Lolita dresses are styled like a cheongsam. A white cotton undershirt is often worn underneath the cheongsam. Apart from cheongsam, changpao was a long robe without sleeves and collars. The Kim Sisters frequently performed wearing Korean cheongsam and singing popular American songs. In the United States, the Chinese robe is sold as a "men's cheongsam". In the 2008 Summer Olympics, the medal bearers wore cheongsam. Moreover, numerous distinct designs were unveiled and cheongsam became a fashion trend. In contemporary China, the meaning of cheongsam has been revisited again. In a 1962 interview, Kwan said she "loved" the "cheongsam", calling it a "national costume". Many Western designers have integrated elements of cheongsam in their fashion collections. Many schools also require underskirts to be worn with the cheongsam. But debates on the origin of the cheongsam have never stopped in academic circles. The Republican period is the golden age of Cheongsam. The color of Cheongsam were usually cold and rigid.