sober attire.

• 朴素的衣着

sober attire.的用法和样例：

例句

1. I may be speaking out of turn,but you might like to know that your attire does not conform to the dress code here.
   或许我说话有些不合时宜，但是你可能愿意知道你的衣着与这里的服装规则不相符。