camilli

Thus there is no question that the priests were chosen and separated from the people in such a way as to meet with the approval of the gods; and even the acolytes, _camilli_ and _camillae_, boys and girls who frequently appear in sacrificial scenes on monuments, wore the _toga praetexta_, and, in order to be acceptable, must be the children of living parents. [

The Religious Experience of the Roman People From the Earliest Times to the Age of Augustus W. Warde Fowler 1884

The origin of this feeling is probably to be found in the fact that both boys and girls were in ancient times brought up to help in performing the religious duties of the household, as camilli and camillae (acolytes); and this is perhaps the reason why they wore, throughout Roman history, the toga praetexta with the purple stripe, like magistrates and sacrificing priests. [

Social life at Rome in the Age of Cicero W. Warde Fowler 1884