He is in his everyday clothes.

他穿着平常的衣服。

youdao

He wears everyday clothes today.

今天他穿一身便服。

youdao

He likes wearing everyday clothes.

他喜欢穿便服。

youdao

Her uniform: everyday clothes, plus a pair of fluffy white-and-blue slippers shaped like airplanes.

FORBES: The Slipper Solution

Clothes with everyday designs are worn regularly in business and academic settings, while special varieties are incorporated into celebrations of marriage and pregnancy and into puppet theatre and other art forms.

UNESCO: Culture

Those are deductible only if you must wear them as a condition of your employment and the clothes are not suitable for everyday wear.

FORBES: Why Santa Won't Owe Any Income Taxes This Year