So who is Me&Em's target customer?
I don't know, and chances are they don't either!
But the response is largely what I expected. An absolute refusal to believe that this phenomenon, real as it is, isn't being caused by a conspiracy to lie to plus size women. And also (I wasn't going to mention it) the really rather inexplicable consumer expectation that they should be able to find something that fits them perfectly, off the rack, in the mass produced clothing store of their choice, in a size they approve of.
I value ethical and environmental practices over size-flattery
There's no size flattery going on, so it's a bit of a moot point. However, you raise something else that's significant. When asked, everyone says that they'd rather buy less and spend more per piece on quality and ethics and longevity of the garment. Actual sales, however, do not bear this out and personally I think a huge amount of it is down to the explosion in cheap fast fashion. Even if you don't buy from such places (and chances are you do but don't realise it - it's more ubiquitous than you might think), they are driving prices down and down until the disparity between their prices and the real cost of responsibly sourced, ethically produced, high quality garments to last years and years becomes so stark that people are scared of it.
Price has become the point of competition, far more than any of us want to admit, and that's another reason why everything is going to pot. Overall, consumers are valuing cheap clothes over good clothes, no matter what they say, and the result is the absolute shitstorm of sizing and quality that we all know about by now.