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Size Hip (IN) Height (IN)
YXS 26.5-27.5 48-51
YS 27.5-29.5 51-54
YM 29.5-31.5 54-59
YL 31.5-33.5 59-63
YXL 33.5-35.5 63-67
Size Hip (CM) Height (CM)
YXS 67.3-69.8 121.9-129.5
YS 69.8-74.9 129.5-137.2
YM 74.9-80.0 137.2-149.9
YL 80.0-85.1 149.9-160.0
YXL 85.1-90.2 160.0-170.2

Source: Mizuno youth clothing size chart. Centimetre measurements are converted from the supplied inch values.