More details from our Sewing Advisors:
How to use this guide: The back of the pattern envelope calls for 2-1/4 yards (2.10m) of 44"-45" (115cm) width fabric; the fabric you choose is 50" (127cm) wide. Find 2-1/4 yards (2.10m) under the 44"-45" (115cm) column and read across the same line to the 50" (127cm) column. You'll find that with that fabric width you need 2 yards (1.80m). Napped, one-way design fabrics or large pattern pieces may require additional yardage.