Well, I have ordered! I've gone for the chocolate brown bottoms in 12L and the lighter coloured top and the Mocha as a set in 12 as they don't have longer length in that one. I'll let you all know how they fit and maybe even post a pic if feeling brave...
As for the hate of 'synthetic' fabrics on MN, it's a bit of a mystery to me - many of my comfiest clothes are man-made fibres- without them we wouldn't have nylon tights tights, lycra swimsuits and bikinis, technical leggings, fleece, waterproof coats, seam free underwear, faux fur etc. Viscose and modal are breathable and comfortable to wear and more durable than cotton. Cotton and wool are great but they aren't infinitely better for many things- wool is itchy as hell and cotton can be stiff and fades easily.