Hi, false1.  I think the modifications you made to the topology in Blender have caused problems with the underlying UV coordinates.  Using Decimate, and/or pushing polygons around on the mesh, will typically cause distortion to the underlying UV coordinates, and make the textures misbehave.  It appears that you now have a lot of distortion in your texture map, and particularly there around the shoulder, you may have actually pushed the mesh points past the original UV seams, causing severe tiling and distortion to the pattern in those areas.  If you are familiar with UV editing, you may be able to correct this issue manually, or perhaps you would be better suited to simply unwrap it anew, and use a tileable texture map to create another texture for it.

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