JK (Joshi Koukousei) uniforms for girls inspired by Japanese high school uniforms.
 A set of JK uniforms normally includes a cute pleated skirt, normally high waist, and a short shirt with a bowtie matching the skirt for summer.
JK uniforms are commonly seen in Japanese comics and become more and more popular to wear as a kawaii casual daily outfit.

Click Everything About JK Uniforms for more information about this kind of casual kawaii fashion.