If you own Style Savvy: Trendsetters, you should download this update.
This update fixes a bug that causes the Black Open-Back Turtleneck to disappear from your closet after being acquired.
After the download, the icon for this data won't appear on the Nintendo 3DS HOME Menu. The data will instead appear in System Settings under Extra Data, so please don't delete it.
For additional details on how to install the Update, please check our Consumer Support Site.