Hi,
Below are some size fabrics to make this pattern larger.
Keep in mind the "over 2" I have shown are finished pattern measurements. Stitching "over 2" increases the size but also can decrease the clarity of detail if you stand close to project when it comes to any detail.
You will need to add 2-3 inches on each side of width and height to figure out what fabric measurements you need for matting and framing. Don't forget you will need to increase your number of strands when stitching for good coverage.
Hope this helps. I am NOT a ECS employee but a stitcher that saw your question.

11 count ( over 2) : 15 1/2 inches wide by 23 inches tall

14 count (over 2): 12 1/4 inches wide x 18 inches tall

16 count (over 2): 10 3/4 inches wide x 15 3/4 inches tall

18-count (over 2): 9 1/2 inches wide x 14 inches tall

22 count (over 2): 7 3/4 inches wide x 11 1/2 inches tall