The images above are from the magazine where the 45" size sweater is shown laced and modeled with plenty of positive ease at the bust.
The images below are of our Interweave Gallery Gals wearing the same sample sweater.
Special note on sizing from Lisa Shroyer, senior editor of Interweave Knits:
Because of the expansiveness of the gauge in the layette stitch pattern, this garment can fit a range of bust sizes; as you can see, the sample 45" garment looks good on our model and the Gallery Girls, all of whom fall below 40" at the actual bust.
However, the garment can accommodate up to a 44" bust, with much less positive ease than shown here. Whether or not you want the garment to "accommodate" your bust in this way (with little ease) is up to you. For myself, I would strongly consider the circ of the ribbed lower body. Choosing a size that works for you in that area is almost as important as choosing one that works at the underarm/bustline. The bodice will naturally contract because of the strong contraction of the ribbed lower body, but the bodice can be spread to the full measurements as given.