Regency Children’s Clothing. The boy’s costume here is known as a “Skeleton Suit” which would have been worn up to age 8 or 9, after which he might be put into breeches and waistcoat, with a relaxed long jacket. The girl’s gown is made from white cotton muslin, the perennial favorite of this period. The model shown is wearing a pair of cotton lawn pantaloons, frilled with voile at the legs, attached to a small bodice. The silk sash was an indispensable part of this look.