What is Yoshika (the girl on the right) Wearing? An apron?
Yoshika is wearing “Kapppougi” (割烹着, かっぽうぎ) in this image from “Strike Witches”. “Kappougi” is a kind of apron. It was invented in Japan and is designed to be worn on top of a kimono.
Kimono sleeves are so long that they tend to get dirty with a sleeveless apron. Therefore, there are large sleeves on “Kappougi” to accommodate the long sleeves of a kimono. In olden days, Japanese women needed “Kappougi” because a kimono was considered casual clothing. In modern times, Japanese women usually don’t wear kimono, so they often wear regular aprons instead of “Kappougi”.