How can I recreate this gradient transparency effect on a mesh?

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#1

I couldn’t find the model on marketplace, nor anything like it. The main focus is the torso, which is transparent on the inside, and sort of gradually fades into a non-transparent outer-part. How could I recreate this, preferably with Blender?
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#2
  1. Vertex coloring (though probably wouldnt work in this situation)
  2. Textures with transparent alphas (did i say it right)
  3. Paint over the pre-existing texture with a specific brush (i dont know what brush it is)
#3

The 2nd option looks plausible, I’ll try it when i get the chance. Thanks for the help