It is Chinese size and smaller than the USA size.
Please check the size carefully.
US X-Small=China Small:Length:35.04"(89cm),Bust:33.07"(84cm)
US Small=China Medium:Length:35.43"(90cm),Bust:34.65"(88cm)
US Medium=China Large:Length:35.83"(91cm),Bust:36.22"(92cm)