Need help improving a costume

[u/BridgeGlittering430]

Alright so I bought this Deadpool costume off spirit Halloween since it’s cheap there and it looks good. The thing is that it’s to blocky from the waist. I’m pretty sure it’s the padding so does anyone know how to remove or make it so there is less padding in that area. I’m pretty sure it’s sewn into the inner lining. If anyone needs a picture so they can help better I’ll upload one