I do not believe it was commonly worn in Britain or Europe. Searsucker short pants were worn by boys from the 1930s through the 60s. The photograph was probably taken in the 1890s. Satin Satin was first produced in China, probably in the 14th Century from silk. It is a woven fabric characteristic by a glossy face and a soft slippery texture.
Satin is an expensive fabric and only used in costly garments.
Caviliers, both adults and boys, might wear satin coats and breeches. Satin was often used for sashes decorating fancy suits like Little Lord Fauntleroy suits in the late 19th Century. Boys suits with open necks were sometimes made of satin. Serge Serge includes a variety of twill weave fabrics with a characteristic diagonal wale. The term serge first appears in the 14th Century.