I've had some trouble recently buying from Ebay--it seems that the meaning of different seller's measurements can vary enough to matter. I'm now wondering whether, at least for the basic suit size (not sleeve and trouser lengths) it might be better to rely on the manufacturer's stated size. In my experience, for example, Zegna size 52 gives me a nice, trim fit, 54 will give a looser fit, but is OK with a little bit of taking in. Can I assume that unaltered Zegna 52's and 54's will be reliably consistent in size? What about other manufacturers such as Canali, Brioni, Corneliani. Do they tend to run larger or smaller than each other, or is there no consistency within brands?