Well, thar she be:
Stacks of patterns 1 a and 2 b, alternating the pattern gradient direction every other row. I'm liking it, I think.
Then, too, I've tweaked the colorbox to try and help the patterns read better. The rule of thumb, I suppose, is that FI motifs must be light on dark, or dark on light for the pattern to pop - I've cut out the lightest blue (background) yarn, and have added a very deep navy, making the background color transition fairly smooth within a very dark spectrum and making the pink pattern look a bit more coherent by contrast.
Heaps of thanks to everyone who weighed in on this and on the button question. I'm thinking that I'll go with the overlapping-shoulder style described by several of you (perfect, since I detest buttonhole math) - if the garmet were laid flat, would this be about right?