I don't know about hair thickening styling products so I can't help you there. However, there are many good hair thickening shampoos and conditioners out there that you might look into. Among the three shampoos I cycle between, one of them is a thickening shampoo. It is Redken's "Headstrong" shampoo and conditioner that is supposed to enhance thickening.
I imagine that a thickening shampoo might be a bit subtle for what you are asking for. If you want a more immediate effect, perhaps toppik or couvre might be what you are looking for?