During the later Regency period little boys wore skeleton suits, and frilled collar shirts. The fashion for collars persisted until the time that this text was printed

[Callahan, Colleen R. History of Children's Clothing. http://fashion-history.lovetoknow.com/fashion-history-eras/history-childrens-clothing]

Regency fashion for children? Skeleton Suits! Sharon Latham http://sharonlathanauthor.com/regency-fashion-for-children-skeleton-suits/