Shirt
An item at Metropolitan Museum of Art
Most likely, this shirt is part of the boy's ensemble, 2009.300.625a–c, which mirrors the fashion for plaid which was prevalent at that time, made popular by Queen Victoria and Prince Albert. A properly dressed boy would have worn an outfit such as this. Appropriate for the period, knickers accompanied boy's ensembles with skirts as an alternative to the girl's pantalettes.
The Costume Institute
An exhibit at Metropolitan Museum of Art
The Costume Institute's collection of more than thirty-three thousand objects represents seven centuries of fashionable dress and accessories for men, women, and children, from the fifteenth century to the present.