Item Sizing: The size guide found below is specific to the costume in this listing. Other costumes may have different sizing patterns. For example, company A's size medium may be equivalent to company B's size large. Be sure to check the size chart closely to make sure you know what you are ordering. The list below may indicate that more than one size fits you. If you are unsure of which size to choose, then go with the larger size because these costumes may tend to run small.Measurements are stated in inches.Size X-Small | Chest 22-23 | Waist 21-21.5 | Height 39-42 | Age 3-4 yrsSize Small | Chest 23-25 | Waist 21-23 | Height 42-48 | Age 4-6 yrsSize Medium | Chest 26-27 | Waist 23-24 | Height 48-54 | Age 7-8 yrsSize Large | Chest 28-30 | Waist 24-25 | Height 54-58 | Age 9-10 yrsSize Large Plus | Chest 31-32 | Waist 30-31 | Height 55-57 | Age 9-12 yrsSize X-Large | Chest 31-33 | Waist 29 | Height 59-62 | Age 11-12 yrsSize One Size | Chest | Waist | Height | Age 4-12Item Color(s): This item's color(s) may vary due to inherent variations manufacturing dye application or your computer monitor's color settings.