For the past two hundred years or
so, female fashions have changed more rapidly than male fashions. By 1913, if
parents kept their boys in the right kind of trousers, they were pretty much good to
go. As the New York Times noted:
Nowadays the problem of dressing boys is made easy by the
custom of putting them into tailor-made clothing at an age when they used to be
dressed in kilts and petticoats. They have but a year or two of linens, and then
the manly knickerbocker suits relieve the mother of further responsibility.
Boys seemed to prefer a more uniform look than girls. Again,
from the New York Times:
While I believe that vanity is not monopolized by girls, I do
know that they are more sensitive to attire than boys. It has been said that the
male instinct revolts against anything which is conspicuous, while the feminine
instinct rejoices over whatever suggests a superiority to commonplace attire; that
a little girl will strut in garments of unique cut or color, while a little boy
forced to wear a flamboyant necktie or a new-fangled jacket slinks out of sight.
For hundreds of years -
right on up to the early 20th Century, in fact - little girls from wealthy families
were dressed to look just like miniature women, complete with corsets,
off-the-shoulder bodices, and high heeled shoes. Because it was not expected that
these girls would be physically active, it didn't matter that they couldn't move
freely, or that the clothing was hard to clean.
As for working class girls, their dresses were made of rough,
serviceable fabrics such as homespun wool and cheap linen.
Until pantaloons became popular in the 1840s, no respectable
female - regardless of age or socio-economic class - wore pants; not even in the
form of underwear. People were afraid that such clothing would diminish maternal
instincts in girls and endanger the very future of the American family!

By the end of World War One, practicality had taken root in the
realm of fashion. Needlecraft Magazine, a publication aimed toward
lower-middle-class American homemakers with aspirations towards the solid
middle-class, told its readers:
The designers of children’s clothes today study the types of
the little wearers to good advantage, and practical, simple clothes which are suited
to the child are the result. It is no longer considered good taste to dress a child
up in yards of ruffles and large satin sashes. The “doll” dress with the long French
waist and short skirt, literally covered with lace and worn over a colored silk slip
is a thing of the past.