This uniform is an example of the costumes worn in image clubs.
An image club (イメージクラブ,imējikurabu?), or imekura (イメクラ?), is Wasei-eigo that indicates a type of brothel in Japan similar to fashion health parlors. They differ in that image clubs are themed along popular sexual fantasies such as an office, a doctor's surgery, a classroom, or a train carriage. The prostitutes themselves, whose activities are usually limited to oral sex, wear exaggerated costumes appropriate to the setting and the desire of the customer. Image clubs simulating molestation of female train passengers became popular in the wake of stricter enforcement of laws against groping on trains.
Image clubs may offer itemized pricing for particular services such as taking instant photographs, removing a woman's underwear or taking it home. Women working at image clubs are paid around 30,000 to 35,000 yen per day and may make more than 1 million yen per month.