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it is highly recommended to read through all the instructions before starting to knit !!!
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holding yarn double throughout on 4mm needles.

Need to knit additional rows of the upper back and upper front, to reach the necessary length to underarm before armhole increases (repeated rows 10 to 16 and rows 1-9)
before armhole increases.
Increased length of body too.

Using 3.5mm needles for the ribbing.
After the last 3 garter stitch ridges I ended with a knit row before BO with 3.25mm needles and only the bamboo yarn.

Neckline: CO 106sts. with 3.5mm needles and knitted 1purl row, 1 knit row, 1 purl row and 1 knit row before BO.