I'd love to be able to simply buy clothes with sizing that is 100% consistent and doesn't vary from year to year. Several times I've ordered what I thought was

I'd love to be able to simply buy clothes with sizing that is 100% consistent and doesn't vary from year to year. Several times I've ordered what I thought was an identical product to something I already own, only to find the fit is slightly different. I'm not sure whether this is due to manufacturing inconsistencies or the style being updated, but it's so frustrating. I would like to be able to know that I am (say) t-shirt size L and style 'xyz' and body length '3' (or whatever information is needed) and know that I could keep on ordering different products with that same spec forever, and they'd all fit the same. No more wondering whether 'slim fit' means the same thing as it did last year or whatever. Same with shoes. I've bought running shoes in the same size from the same manufacturer and they've been a totally different fit. If a company did this and the clothes were actually nice as well, I'd probably be a customer for life.