Sailor Fuku is one of the two common styles of JK uniform, the other one is the blazer-style uniform. 

JK Uniform was worn by Japanese female students in junior high school, but now it's considered a casual Kawaii fashion.

Sailor Fuku normally contains a sailor fuku top(normally with a sailor collar, or a bowtie) and an adorable pleated skirt(normally high waist).

You can find sailor outfits for kids, sailor JK outfits, navy collar Kawaii dresses, sailor collar swimwear, and Kawaii tops with navy collars in this collection.