How can I liberate my heart from consumerism?

I've taken the first step which is liberating my mind. I understand that goods do not make me who I am and that buying more than I need is bad for the environment. I have taken the equally important step of reducing my buying and changing as much as possible to second hand. Still, I have the urge to buy more than I need. I resist that urge, but society is pushing the idea at me and it can be hard to resist. My subconscious mind has been invaded by consumerism and I want to free it. I intellectually know that I have as much clothing as I need, but I irrationally I want more. I want to be able to deflect the brainwashing of capitalist society. Help?