I can't tie this collar button.

我不能系上领带。

youdao

Unbuttoning my top collar button.

不扣衣领最上面的纽扣。

youdao

I can't fasten this collar button.

我系不上这个领扣。

youdao

It would be the size of a collar button and spin at more than 2m revolutions a minute.

ECONOMIST: A personal eye in the sky

Wearing a button-down collar shirt with a suit and tie has sometimes been frowned upon by purists.

WSJ: Guide to Men's Shirt Collars: Which Styles Go With Which Occasions and Flatter the Face

Fans of a tweed sport coat with corduroy pants for the office should opt for the sporty feel of a button-down collar.

WSJ: Guide to Men's Shirt Collars: Which Styles Go With Which Occasions and Flatter the Face