Size 
23(14cm), 24(14.5cm), 25(15cm), 26(16cm), 27(16.5cm), 28(17cm), 29(18cm), 30(18.5cm), 31(19cm), 32(20cm), 33(20.5cm), 34(21cm)

 

My daughter's feet with high insteps is 16.5cm long, and she wears the size28.
甲高幅広の娘の場合、実寸16.5cmで28を履いています。