The material is polyester， cotton and netting， good quality with hoop inside.<br /><br />Please check the size chart as below， the unit is CM.<br /><br />It's better to measure the girl before choosing sizes and compare with the size chart.<br /><br /><br /> Age (Y)       Chest(cm)    Waist(cm)    Length(cm)<br />     2-3Y            58                 56             67        <br />    4-5Y             62                 60             76       <br />    6-7Y             64                 62             85        <br />    8-9Y             70                 67             94        <br />   10-11Y          76                 73            100      <br />   12-13Y          82                 78            107      <br />   14-15Y          90                 83            115