This robe originated from the Great Jedi Library located on Ossus. Ossus Keeper robes were the attire of Jedi who functioned as Keepers within the Hall of Knowledge situated inside the Great Jedi Library on the planet Ossus. This was before its devastation during the Great Sith War circa 3996 BBY. These robes substantially enhanced the Keepers' mental capabilities, assisting them in preserving the secured archives and providing guidance to those seeking interactive resolutions to their issues.
It's been said that Meetra Surik was gifted a set of these robes by Queen Talia of Onderon as a token of gratitude for her assistance during the Onderon Civil War around 3951 BBY.