Vanity sizing is a different beast. Any other understanding of my post? I hope I was able to put it into words clearly.
Edited for clarity: Is there such a word in English like a mis-sized garment? Eg. a pair of jeans sized 31 and next to it a size 32 - both are the exact same models from the exact same manufacturer! - and they measure the same, so one is mis-sized.
I am not native. I just asked because Google did not give any hits, but it can be a serious issue, esp. with online shopping!
Oh, no then. It could just be called varied or inconsistent or mis- sizing, or some people would say poor quality control. No specific set of words for that.