Known in Japan as That's QT, the player is put in charge of a fashion boutique, and is required to design, and sell clothes. Making clothes requires collecting keywords, which certain combination of words creates certain pieces of clothing. To sell your clothes, you must set up a store, and stock it with your items, as well as hire employees to take care of the store. You are set against rivals, who like you are selling clothes. In game you can also take part in "fashion battles", in which you are put against a rival to design an outfit based on a certain amount of items. Your outfit is then judged on several criteria.
The game is broke into several stages, in which you must meet a certain objective to get to the next stage. In different stages your store is located in a different part of town, as well, the size of your store also changes, as well as your rivals.
Source: Wikipedia, "Pop Cutie! Street Fashion Simulation," available under the CC-BY-SA License.