While it’s true they are using more ‘technical’ fabric, their words, not mine, I still find them to be better quality and far less sweaty than the usual polyester or poly-blend.
I think with COS, those who love it, really love it. We all know to take the way the clothes are modelled on the website with a pinch of salt.
As the PP said, you get to know what suits you after a while. Indeed, I was able to buy a few pieces online in the sale and all fitted perfectly. If you’re near a store, go in, they have a glut of sale stock as so few people are going shopping!