polo neck BrE
roll neck BrE
turtle neck AmE
skivvy AusE

However, the polo neck in all its forms soon became a standard wardrobe item for both sexes during this period.

He was wearing a dark woollen blazer with a black polo neck beneath.

She wore a cling sweater in winter-white with a polo neck.

Wearing jeans and a polo neck, he was sitting on the piano stool, his legs crossed.

She wears a yellow jacket on a black polo neck with enormous earrings.

And I got two polo necks one with slight ribs in.

In the 1950s the black polo neck became a distinctive mark of existentialists.

Most children wouldn't care if she was wearing a polo neck or this 'low cut' dress.

Is it just a polo neck sort of type?

She wore jeans, a polo neck and a leather jacket - all black.