Skeleton suits are often described as one of the earliest fashions to be specifically tailored for children, rather than being adult fashions sized down. Previously (and subsequently) young boys wore dresses until they were breeched, or put into trousers.
Historically, skeleton suits have been recognized as among the first clothing styles tailored specifically for children, rather than being adapted from adult designs.  Previously and in subsequent periods, young boys typically wore dresses until they reached a certain age when they were fitted with trousers.