: The game features approximately 12,000 items , including clothing, accessories, and—for the first time in the series—bags and men's fashion.

: Players do not just dress characters; they manage a full boutique, which involves scouting for stock at the Exhibition Hall, managing inventory, and decorating the storefront to attract specific types of customers.

The game’s brilliance lies in its "happiness" mechanic. As players satisfy customers by matching outfits to their unique personalities and styles (such as Girly, Bold, or Chic), they collect "moonlight" or "happiness dust". This fills a jar that, upon reaching a full moon, triggers real-world growth in the game's city, unlocking new locations and story events.

Developed by and published by Nintendo , the New Style Boutique series began on the Nintendo DS in 2008. The 3DS installment, often referred to as the second game in the chronology, significantly expanded the series' scope: