“Otome, also known as Otome Kei, is a style that was created in Japan in the 1970s. Otome, meaning ‘Maiden’ in Japanese, is a style heavily influenced by 1960s mod fashion and femininity.

There is no defined look or definition of what the fashion is exactly. It is an incredibly varied style with very little restrictions. Unlike a lot of Japanese styles, this style is able to be worn both casually and formally. This style is very commonly worn in Japan, but does not have a large following worldwide.

Otome is a very popular fashion amongst those who wear Lolita, and is often considered a casual alternative to the style and worn with lolita JSK’s without a petticoat.” - The Jfashion Wiki