I apologize for the delay in replying to your post. The truth is, I need to do a full blog post about this and haven’t had a chance yet. To answer your question quickly, I simply trimmed 4″ from the bottom of the pattern piece for this particular pattern, since I didn’t want the tunic to flare as much as the dress and didn’t want to shorten in the middle the way patterns are often shortened and lengthened. However, in general I would recommend drawing a line perpendicular to the grain line and using that line to splice in more (or less) length, and then blend the edges of the pattern piece to complete the revision. The placement of the line depends on the pattern: for a pant leg or a skirt, you would probably position the line about halfway up the pattern piece. For a dress, I would suggest halfway between the hem and the armhole. We don’t put a line on the patterns because I fear it would clutter the pattern pieces and make them confusing (especially since each size would need its own line in many cases). But I promise to expound on this some day (hopefully soon), with photos to demonstrate.
