What about: Jo B. Paoletti, Pink and Blue, Telling the Boys from the 
Girls in America, 2012, http://muse.jhu.edu/books/9780253001306

Best, Jan Selmer

Susan Walter wrote:
> July 3, 2015 Hi All,
>
> I have a project luckily augmented with the family’s photos.  My male
> subject was born in 1881, and the first photos of him depict him
> wearing little kilts / dresses.
>
> Has anyone got good references about the gender neutral dresses for
> young children that was common up even until the 1930s?  I’m not
> finding much written at all, except that that both boys & girls wore
> the same type of garments up to about the age of 5.
>
> I’m positing these open bottomed garments were helpful for diaper
> changing...
>
> I used to have a book – it was called something like When Boys Wore
> Dresses – and it showed a young boy (the author’s son) on the cover
> in a short dress.  I cannot find the darned thing, either here in my
> office nor trolling around amazon.  Anyone recognize that?  Or know
> of other references?
>
> I appreciate any help! S. Walter
>