Yep I agree with all you have said, and anyone selling clothing who just state the size as a Medium or size 12/14 , for example. I will avoid, as all Brands / shops have different sizings.
Personally, I think any seller selling clothing items and does not add full measurement, e.g. waist, chest, leg whichever appropriate, even laying a tape measure across those salient points, is leading to case of items not as described.