Fabric consumption is how many metres a garment needs. It follows from the pieces, the fabric width and the cutting layout, not from the size alone.
With digitized pieces the consumption can be worked out on screen. Arrange the pieces on the fabric width, read off the length, and buy accordingly instead of estimating.

Digitize sewing patterns without tracing.
Test PatternScan Pro free for 14 days with the full feature set. You need your smartphone, a printer and one pattern you always wanted digital.