So as it turns out, the trouser length is likely *inseam* length and not the garment length (which is what I thought it meant). I ordered an L, to accommodate my hips (102cm), and so I thought 85cm length would be fine. It was not fine as it turned out to be far too long, and I will need it to be hemmed. For reference, I am 162cm tall or so, and in these photos, I've pulled up the trousers as far up as they can go -- up to my lower ribcage, and not sitting at my waist, btw.
The fabric is nice, ...