Fixing dress edges shading

When shading the edges of a dress with a subdivision modifier using a toon shader, the resulting shading often will look very bad.

The reason, there is not enough info for the edges to smooth themselves.

You will need to activate "use custom normals" in the subdiv modifier.

Select the edges in Abnormal, 2 edge loops to get better coverage

Slide strength & smooth iterations higher, then click Smooth Selected Normals a few times until the normal indicator no longer moving

Now the shading of the outer edges follow closely the inside edge.