Jamieson's Shetlands sizing

What's your experience with sizing in Jamieson's Shetlands? The consensus seems to be that you need to size up, but looking at the measurements on End I'm not so sure. I'm looking at a particular piece where the chest measures 56 cm if I size up. My chest is 50 and most of my sweaters are about 52-53, which admittedly fit me -comfortably- tight, so maybe I just need to embrace the loose tide? Anyway, I'd like to be as sure as possible before I order as a return would be out of the question.
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