>>93721684Rough paint edit(don't have PS/other on this machine) but you can see the curvature assumed from the lines isn't similar between Fuwawa and the other two.
Raora's does seem to measure close to where her sideboob "fold" would be, and the same with Nerissa. For Fuwawa though the shape assumed with the line comes out to a circle instead of an ellipse.
Raora also has a profile shot without her jacket where her entire sideboob is visible, IDK why the "jacket on" version is used here.
The issue is none of Fuwawa's profile shots for her outfits have any visible sideboob "fold" line/curve, but that doesn't mean you can't make a better guess.