Well, I managed to do a quick rig of the gown ;) but the amount of clipping is enormous :D
I noticed that I have to do some color adjustments since Substance Painter shows some tones differently. The white sleeves have to be brighter for sure and maybe the red has to be a bit darker and warmer.
Exporting the textures was a challenge since I mapped the model dividing it into parts: bodice, sleeves, overskirt, underskirt. And the final texture sets were like: jewelry, overskirt, underskirt, bodice, oversleeve undersleeve. So it's nice to divide your textures with the materials in mind more than the actual model part.
Hope I'll be able to do a nice rig next week and I know already that this gown is a bitch to rig in the sleeves area.
K.