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.