It's Asian size,please check the detail size on the size chart image.
<br />100% Brand New.
<br />Material: Cotton Blend
<br />T-shirt Color: White
<br />Pants Color: White and Navy Blue
<br />Department Name: Children Girls
<br />Item: T-shirt and Pants
<br />Pattern: Letter
<br />Style:Fashion
<br />Collar: O-Collar
<br />Sleeve:Short Sleeve
<br />Pants Waistline:  Elastic
<br />Pocket:No
<br />Design:Casual
<br />Package Content: 1 xGirls T-shirt and Pants
<br />Note:
<br />1.   Hint for choosing proper size,   use similar clothing to compare with the size.
<br />2. Choose larger sizes if your size are same as the flatmeasurement Sizechart.
<br />3. As different computers display colors differently, the color of the actual item may vary slightly from the above images, thanks for your understanding.
<br />Size:Thereare 5 sizes (90,100,110,120, 130) available for the following listing. pleaseallow 1-2cm differs due to manual measurement, thanks (Allmeasurement in cm and please note 1cm=0.39inch)