A crisp sweater, knit from the bottom up in the round.
This pattern uses kitchner stitch (or grafting) to join the underarm area, and assumes you know how to do the stitch.
You may want to find a tutorial on kitchner if you have never used it. This pattern is very easy to lengthen or shorten, as it has no shaping in the body!
This pattern is sized from a 30 to a 54 inch bust.