[GreenPencil7]

Using a T-shirt as an example, I propose an API where there is an immutable part -- the T-shirt body. It is about the properties of the fabric, color, and style. These parameters are standardized and do not change. And there are engineering solutions that change, and this is where there is progress and novelty. It is about logistics and production. I assume that the next stage of development is cotton printing. Is this solution technologically new? Absolutely. Can we make it so that a T-shirt buyer does not feel the difference? I assume yes, and this is the task and philosophy of the project.

My project is not about an audience that is looking for "the next new thing". I am researching if there are people who care about preserving a choice they already made and not spending their resources on searching for a replacement.

About sizes I agree. A person changes with age. I think this can be considered in the size range. After some time a customer takes another size, but the item remains the same in material, color, and style.