正装用英语可以表达为 formal wear。这个词来源于英语单词 formal，意思是“正式的”。

例句：

He always wears formal wear to the office. 他总是在办公室穿正装。

She chose a beautiful formal wear for the prom. 她为舞会选择了一套漂亮的正装。

The invitation said formal wear was required. 邀请函上说需要穿正装。

翻译：

他总是在办公室穿正装。 He always wears formal wear to the office.

她为舞会选择了一套漂亮的正装。 She chose a beautiful formal wear for the prom.

邀请函上说需要穿正装。 The invitation said formal wear was required.