It is Chinese size and smaller than the USA size.
Please check the size carefully.
US Small=China Medium:Length:25.59"(65cm),Bust:37.80"(96cm),Shoulder:14.96"(38cm),Sleeve Length:25.59"(65cm)
US Medium=China Large:Length:25.98"(66cm),Bust:39.37"(100cm),Shoulder:15.35"(39cm),Sleeve Length:25.98"(66cm)
US Large=China X-Large:Length:26.38"(67cm),Bust:40.94"(104cm),Shoulder:15.75"(40cm),Sleeve Length:26.38"(67cm)