Even though he'll be angry, I'm going to throw out all the clothes that my ex buys for our child.
Why do you plan to throw away all of the clothes that your ex buys for your child?
I don't like what he buys and he's a terrible deadbeat father.
You shouldn't attach the person to the material item when it is something that is needed and used by your child. Who cares if he is a deadbeat dad but the items he brought are still useful. If you throw them away wouldn't you end up having to spend extra money to buy new clothes?
I don't care about the money I would have to spend, I don't want our child wearing anything he's bought.
You have to do what's right for your child and if that means you accept clothes that your ex bought, then that's what it means. Talk to him and make sure he understands how you feel, this dispute could really end up negatively impacting your child.