Having some trouble with making Milltina base flat chested

I’ve been using a Milltina base for a while and wanted to create a flat chested variant, however I’ve applied the flat texture and toggled the flat blendshape but it has these ugly ridges on it still and I’m not sure whats causing them.
Does anyone have any ideas? I’m no expert in Unity but I’m learning.

Are you able to use the FC_Milltina variant instead of Milltina? FC_Milltina is a premade for flat chests.

I’ve asked a friend for details and here’s what he had to say.

FC_Milltina is a preferred option, but you can get good or acceptable results on a regular Milltina variant by recalculating the normals after adjusting the blendshapes. PA Recalculate Normals can do this non-destructively in Unity.

Import both Non-Destructive Modular Framework (dependency) and Haï ~ Prefabulous Universal into your project via VRChat Creator Companion or ALCOM. (Haï’s package seems to be missing an automatic dependency on NDMF, so both must be imported to a project manually.)

Adjust the blendshapes on Milltina_body as needed (namely, Breasts_Flat = 100, (Wear bra)Breasts_Cow = 0).

Replace the Milltina_Body.pngalbedo texture with Milltina_Body_FlatChest.png in your Milltina_Body.mat material variant. Apply this flat material variant to Milltina_body mesh, if not already done so.

Select Milltina_body object in your scene, and add a PA Recalculate Normals component to it. Add Breasts_Flat and (Wear bra)Breasts_Cow to the list of blendshapes to recalculate in PA Recalculate Normals.

Build your avatar locally, upload it, or test it in Unity Editor’s playmode. The changes will be applied and visible in play mode/on build/upload.

Thank you! I will try this out when I can and get back to you