The waistline is the horizontal guide line at the narrowest point of the torso. It serves as the reference for lengths and for placing darts.
Guide lines like this one are not part of the contour, and PatternScan Pro does not capture them. If you want to keep them, draw them as separate lines in the vector program or in pattern CAD.

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.