Pattern alterations made were to reduce the armhole depth to 8" which has the side effect of reducing the body length too, and to knit the short rows in front to give a less curved bottom edge.
The yarn is working well with the pattern too. I originally bought it to make a sweater, but was disappointed with the colour and texture when it arrived, as the colour mix was too strong and the yarn loosely spun. However, it's perfect for a fluffy, bulky ribwarmer and is knitting up nicely.
I've also started a lace shawl using more of the bamboo tape yarn. This is the first time I've knitted lace from written instructions rather than a chart, and it's much less intuitive and harder to learn the pattern. It works as long I can concentrate without interruptions, and the lace pattern looks good with the variegated yarn.