The Essential Cardigan
The simpler the stitching on any garment, the easier it is to modify the fit, so this is a great first sweater to custom fit to your own measurements. The pieces of this sweater are interchangeable with the pieces of the Essential Pullover, so some possible changes are already written out for you!
The Essential Cardigan has waist shaping, and traditionally fitted tapered sleeves.
One way to dress a simple sweater up or down is to change the buttons or the edgings. Let those quick additions do the work, and keep the stitching simple.