I think the question should be “what am I trying to accomplish” with this experiment, not “what are the rules and have I broken them with a purchase”.
My first goal is to stop the mindless purchasing because it’s a great deal or because it’s a great look and I wanted to try it for myself. Over the past 2 years, I have amassed a substantial wardrobe and it is time to sit back and enjoy it instead of adding to it.
My second goal is to reduce the size of my wardrobe. That is almost impossible if I continue to purchase things.
My third goal is to find out what brands/items work best for me. I have found that i can fall in love with something, purchase it, have it altered and then wear it 3-4 times before I find that it doesn’t work. I have a few shirts that are fantastic, but because of the deep scallop between the front and tail, they constantly come untucked on the side.
My final goal/objective is to just see if I can do it

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Based on the above, I would have no problem replacing my one pair of running shoes. I would have an issue replacing a shirt because it has a hole (I have ample replacements already, albeit maybe a different style/color/pattern).