cardigan vest
A cardigan without sleeves, resembling an open-fronted sweater vest, usually with buttons.
If a garment (like a jacket) is worn over the cardigan, so it is not clear if the cardigan has sleeves or not, simply tag it as cardigan, not cardigan vest.
Examples
- Danbooru post #4135431
- Danbooru post #4551961
- Danbooru post #2493756: Left: sweater vest
Right: cardigan vest