OP, I think you have got a bee in your bonnet about this ‘Toast’ middle class this and that.You are reading too much into it and taking it all too literally.
The truth is, you could go into any shop in the high street, from Primark to Gucci, and half the stock will be bizarre / hideous. You will wonder, “who on earth buys this crap?’
Yes Toast has some weird shapeless ‘cult-looking’ clothes, I’m sure. You do wonder who designs these things. But equally, there have been threads on here about M&S and some of the monstrosities they put out there. You could have a thread like this on literally any shop.
I don’t shop in this ‘Toast’ but I would imagine, that for those who do, they hardly buy the whole shop! They just buy one or two things and wear it with stuff bought from a whole range of other places.
Some women can wear ‘shapeless’ better than others. Yes, I can see your point about these clothes being dour - because most of them are. But equally, if you want to talk about extremes, is it a good look to see women crammed into cheap, badly-fitting lycra or nylon crap that fills so much of the high street. Is this a better look?
Surely, most people just dress according to their lifestyle, body shape, income and personal taste. And they mix and match from all over the place.