I finally hadn’t enough time to create all the UVs. So I decided leave it as it is. I wasted a lot of time correcting the mesh problems, like repeated polygons and non-manifold topology in order to be able to create UVs as well as in define the hard and soft surfaces to define angles of the armor pieces.
Finally I exported it as an OBJ and used Marmoset Toolbag to create a presentation document.
Link to Marmorset presentation: https://www.artstation.com/artwork/X2P5y