Let's revisit Kiyomi
Barbara Gregory's brilliance as an illustrator, really shines through in her colorwork designs and while she is best known for her more whimsical pieces, Kiyomi shows her more sophisticated side.
Loop closures are great for people who don't like working buttonholes, and are easily modified for a different size or number of buttons.
The wide garter stitch collar and placket combo are textured enough to be interesting, without competing with the subtle mosaic colorwork pattern.
If you missed it the first time, be sure to check out Barbara's blog post about the design as well, if for no other reason than to see her original submission illustration.