All measurements are given in Inches. Size to age group comparison is as follows: 18/24 - 18 to 24 months | 2T - 2 years | 3T - 3 years | 4T - 4 years | 5T - 5 years. All measurements are given in Inches. All measurements have tolerance of +/- half inch. All waist bands are elasticated and can stretch 6 to 8 inches beyond the specified measurements.