Screeming Child

So this morning I wake up to Steven throwing a hissy fit and my mom screaming "you'd better get up and make him put his clothes on!" So I roll outta bed to see Steven running around in just a t-shirt and crying. He doesn't wanna put his pants on, he says that he doesn't like them. Mind you the pants my mom is trying to put on are pants that he has worn a ton of times, and all of a sudden he doesn't like these pants. Apparently they are too big for him and he doesn't want to wear pants that are too big. So he's too tall for a 2t and 3t however the 3t and 4t don't fit him in the waist they are way too big and fall off. So he's throwing a fit because the pants are too big in the waist and will fall off. So I make him put the jeans on and he's trowing a fit, I ask him to hand me the socks that he has already taken off in a fit and he kicks them off of the bed. I spank his little butt and he's screaming as if I've pulled his head off. He is throwing a fit on the bed. I'm not sure what I'm gonna do with him at this point. What do you do with a 4 year old that is so stubborn and thinks its his way or no way?!?!?!?!?!