Pop Kei ( ポップ系 ) is a colorful Japanese fashion mostly associated with the Decora aesthetic. The term refers to how the brightly colored clothing "pops" in an outfit.

The style first emerged in the 90s in Japan as teenagers started to create a world that rejected muted, adult fashion norms. During that time, designer Sebastian Masuda founded 6%DOKIDOKI and Sayuri Tavuchi opened Spank!, both being brands that are synonymous with Pop Kei even today. The rise of fashion magazines like FRUITS and KERA helped to spread the style, both in Japan and internationally.

This style is mostly based around graphic tees as well as otherwise printed clothing with '80s pop impressions. It is very similar to Fairy Kei but with the main difference being that it uses bright colors over pastels. The look is often unisex and can feature trousers, shorts and leggings rather than dresses and skirts. Very popular are thrifted and remade clothes featuring cartoon characters, polka-dots, and denim.

External links to help get a better understanding of this aesthetic.