Lena, what you said is exactly what I had in mind when I started this thread.
Take Marc Jacobs's latest collection, for instance. The fashion press praised his daring use of oversized jackets, to give a childish innocent feel, as if it were the biggest risk anyone in fashion has ever taken, and as if it were something relatively unseen. I'm not ragging on him, just trying to point out that there is a steady undercurrent always ahead of its time, always having a strong impact although not always visible.
Softgrey, I see your point about the voluminous silhouette and that makes a lot of sense to me, something I hadn't seen before. However I thought Margiela was playing with something a bit different, like the idea of using a garment that has a prescribed way that it is supposed to fit (like a blazer--we know what it is and how it's supposed to look) and sizing it up about ten sizes. The shape, of course, is big and voluminous, but it's more about the playing with size and patternmaking. I read something about the mathematical way they sized the garments up, and it was so interesting. Yeah but that was so long ago I'm not sure what I'm saying right now. There were a lot of ugly looks in this collection, still I appreciated it for its moments of poetry.