From a Spanish site which can be translated but it is for crochet ~ hopefully will be able to work the schematics out for knitting ~ love the neckline and high buttoning. Make your own buttons ~ Instructions on my board, maker ~ button.
DROPS crochet jacket with mussel pattern in “Alpaca” and “Cotton Viscose”. Size S - XXL ~ DROPS Design free crochet pattern. YG - I would need to add a few rows in yoke section, and make generally longer