Twinning is the term used to describe two Lolitas who have coordinated their outfits to match in almost exact ways. Sometimes contrasting or complimentary colors may be used between each twin, for example Shiro and Kuro twins, or one Lolita wears blue while the other wears pink.

Three matching Lolitas is referred to as Triplets, four as Quadruplets, etc.
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Aren't we KAWAII! I <3 Sweet Lolita