Sweater Vest Tucked In or Not?

[McMurdo]

I am at something of a loss here because I am wondering exactly what is a "sweater vest"? This is a name I have not previously come across, but I suspect it is an American term for something we might have another word to describe.

A sweater I understand - something along the lines of the Aran sweaters I adore at this time of year. On the other hand, a vest is, I understand, the American name for a waistcoat. Personally I cannot believe either of these garments would be worn tucked-in - so, are we talking of something else altogether?

Maybe I am just being extra dense to-night - if so, please excuse me.

Take care,
Ham.

Ham
This is a Sweater Vest


I guess you would call it a sleeveless jumper.