For me, coveting means that I want what I don't have, thinking/feeling I should have it, and in particular, something I'm not supposed to have.
Something that I think about regarding this, IF in fact God will provide all I need, coveting means to be looking past God for my desires.
Like, when I want a "better" car, but my car is running just fine, and is in fact pretty low cost to operate. I don't need a "better" car. God will provide a car when my actually dies. And meanwhile, I am thankful to Him that I don't have to buy another car just yet.
The time will likely come when God will move in my heart to take the steps to replace my car. I need to be sensitive to the Spirit's leading, to know that I'm not just reaching out to grab something not meant for me. God already has His intended provision for me, and I'm to be content to wait upon that.
Does this help?
BTW . . . I've gotten past my "clothes buying" phase, for the most part, but I know exactly what you mean on that!
Much love!