Shiro Lolita, or 'White Lolita,' is a form of lolita made entirely of white/cream/off-white co-ordinates. Shiro Lolitas often pair themselves with Kuro Lolitas in twin outfits to create an interesting contrast.

Shiro Lolita can be taken from any style of lolita, whether it be Gothic, Sweet or Classic, if the co-ordination is completely white then it is accepted as Shiro Lolita.

Art from DA (I think), info from lolitafashion.org