Shiro Lolita (白ロリ) is a Lolita outfit made entirely of white/cream/off-white clothing. The wearers often pair themselves with Kuro Lolitas in twin outfits to create an interesting contrast.
The style was originally born in pre-print times in order to differentiate all-white Sweet Lolita coordinates from Gothic ones, but there are instances where Shiro Lolita is mistakenly used for white outfits regardless of style.
Shiro also follows the same guidelines of most of the other Lolita styles, so is still fairly easy to pull-off for beginners.