Why are my pockets so dark after baking?

I created a jacket in CLO3d and exported as OBJ for use in Substance Painter. After baking my pockets become very dark (and collar is lighter). I feel it is due to the ambient occlusion reading the position of the OBJ when imported - the position of the OBJ is not straight. The dark pockets are also visible when adding a material to the jacket and it looks like the pockets are made out of a different material. How can I make sure the the ambient occlusion is more even (so thepockets doesn't become so dark)? I have checked UV normals are facing the right direction. I really appreciate some advice.