@Some Dirty Rat
I understand your points now. I also know that some sites offers to view hidden outfit. It is good feature. I have used that feature to buy products.
I think that you should not be worried when they copy your outfits. This is game and for fun. If someone liked some products, then they buy those. Think it like a star fan. Like i follow some big star and i mostly copy their style. This does not makes me culprit.
If you want you hide your products, then the best idea is that you create your own product. Their are many products that i have seen people wearing it, but i can't buy. So this idea is best if your want to stop someone from copying.