You can be loose with following this pattern. The cover does not need to fit your shade precisely in order to look good. In fact it looks better if it doesn't. In other words - you can’t go wrong.
Lampshade Cover Pattern
||This pattern is available as a digital download only; no paper versions of this pattern are available.
||Level 3 - Intermediate
||To fit a lampshade 10½ inches high with 31½ inches top circumference and 44 inch bottom circumference. Piece is 14 inches long