Rotation is a standard-fitting cardigan with asymmetrical fronts. The sizing notes give the chest measurement and suggest choosing a size with 0-4 inches of positive ease. For Rotation, which doesn’t close all the way down the front, you’ll get the most accurate fit by sizing by the cross-shoulder measurement.
I think proper shoulder fit is more important than chest, i.e. a little extra positive or negative ease in the chest is more forgiving but for proper drape the shoulders should hit at the right spot. In general, I would recommend that for all sweaters with set-in sleeves.
So much like I did for Conic, here are some photos of the Rotation cardigan on other people. The sample was knit in the 35″ size.
Rotation is pretty much perfect on me with 1″ of positive ease.
Kathy, who is 5’1″ (with heels on) and slim, should actually be wearing the 32.5″ size instead of the 35″ – see how the shoulders are too large?
Eileen is much taller than Kathy but is also slim. She might also choose to knit the smallest size.
With 5″ of negative ease in the sample, Gus might be more comfortable in the 37.5″ or even the 40″ sweater. A larger size would drape better in front.
You can see all the photos of Rotation on flickr by clicking on the Rotation tag.