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Two gauges are given in the pattern – the smaller sizes are knit at 4.5 sts to the inch and the larger at 4 sts to the inch.
Yardage: 1(580), 2(640/720), 3(710/800), 4(760/850), yards of Artesano aran in shade 8316 (A) and 1(380), 2(420/470), 3 (470/520), 4(500/560), yards in shade c853 (B) (Italics indicate second gauge range.
To make this sweater, you should be a fairly confident colourwork knitter, happy reading charts, and able to maintain an even tension with an aran-weight yarn.
You may wish to read this post, in which I share my top colourwork tips for knitting this sweater.