The pattern is scaled directly from the "going away" dress that is owned by the Parsonage Museum and worn by Bronte on her marriage in 1854.  This set includes three pages of the scaled pattern, two pages of sketches of details on the original, and a documented summary of the dress and its history.

The only condition issue is that the upper right-hand corner of the cover "page" has been clipped away, which you can see in the photos.  Other than that, the set is in very good condition