How is the choir described physically in Lord of the Flies?

From the text:

"The creature was a party of boys, marching approximately in step in two parallel lines and dressed in strangely eccentric clothing. Shorts, shirts, and different garments they carried in their hands; but each boy wore a square black cap with a silver badge on it. Their bodies, from throat to ankle, were hidden by black cloaks which bore a long silver cross on the left breast and each neck was finished off with a hambone frill."