Tess is a Bundle. This cosmetic has been leaked, and the bundle will hopefully be available to purchase in the near future! Tess was first added to the game in Fortnite Chapter 2 Season 5.
How-to Get the Tess Bundle
Tess was leaked or datamined, which means we don't know for sure how it will be released. Most cosmetics that are leaked will be released within 30 - 60 days of their discovery.
Attachments are items that come with a cosmetic when it is obtained.