[SD/Texturing] I need help,need to add seams to the texture of the "abomination" type.

[DREADMAN]

You need to edit three skins.
It is necessary to add seams on three textures like the "abomination".
The seams should be black.
I need stitches because I use a skin on this model.
I'll change the texture color myself.
I would be very grateful if you could help me.