Wearing a coat and tie is an accepted convention on such an occasion.

在那种场合，穿外套系领带是约定俗成的穿着要求。

youdao

It is cold during some University classes, everybody is wearing a coat.

大学教室里很冷，大家都穿着厚外套。

youdao

He isn't wearing a coat and temperatures in the Norwegian capital regularly plunge to -10C during winter.

他没有穿外套，而此时在冬日的奥斯陆，气温一般都会降到零下10摄氏度。

youdao

He is wearing a tall black hat and a long coat.

VOA: special.2010.04.25

He was wearing a special coat made by Brooks Brothers.

VOA: special.2009.07.24

When wearing a coat that has a pattern or a very eye-catching color, it is important to consider the silhouette.

WSJ: A Little Spring in a Coat

Now in its 24th year, one of my all-time favorite print ads for the New York Cares Annual Coat Drive continues to show the Statue of Liberty sitting down in bad weather wearing a coat.

FORBES: How To Make Your Advertising Memorable

And a study carried out in Scotland in the early 1990s found male GPs wearing a suit and tie and female doctors wearing a white coat who were most favoured, especially among older and richer patients.

BBC: NEWS | Health | Doctors 'should not wear denim'