Miss Mouse, have you tried the swrve Milwaukee hoodie? Not sure how small the go, but they seem a pretty warm and not too obviously cycling specific too,for off the bike wear? (I've not actually worn one though...) Good old uniqlo also do some pretty decent & cheap synthetic down type jackets, mine isn't super wind proof, but I like to wear it paired with a light windproof layer for flexibility.
Miss Mouse, have you tried the swrve Milwaukee hoodie? Not sure how small the go, but they seem a pretty warm and not too obviously cycling specific too,for off the bike wear? (I've not actually worn one though...) Good old uniqlo also do some pretty decent & cheap synthetic down type jackets, mine isn't super wind proof, but I like to wear it paired with a light windproof layer for flexibility.