I'm guessing they do the stripes, then they go over it with the white colour again in little strips to make it look faded in places, like cross hatching.
My gut wants to try subtractive, having a basecoat be grey and the white be the top layer. Otherwise I want to say using a finer brush? It's a tricky idea and I'm sure the torso was its own sub assembly to be able to properly reach the cloth
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