Deb Gemmell and Robin Hunter in their book Need A Plus Cardigan? shape the sweaters in a 'new-to-me ' method. The back of the sweater has less stitches - is less wide - than the front. What gives the front it's extra width are underarm increases that form the cutest little darts. These darts, in a Top-Down sweater, begin once the sleeves are separated from the body and are worked every other row until the front is increased to desired width.
Clever!! Or What.!! Not to mention easy. Two of my favourite attributes. Since colour block was all about innovation - top-down construction, simultaneous, set-in-sleeves, Contiguous (of a sorts) shoulder and sleeve cap shaping, asymmetrical front, four different colours, then 'What the heck?'
Why not try one more, new-to-me, construction quirk and go for the underarm bust darts. Despite being too small to use a pattern from the book, nonetheless, I followed Deb's method for creating those underarm darts. Increase one stitch at each underarm, every other row, making sure the increases slant towards the bust until sufficient stitches have been added to give the front it's required width. First attempt and, sorry for my vanity, but I think they look great.
Anatomically correct, sweater design. Never too late to learn a new trick.