进行户外活动时，最好穿休闲服装。

For outdoor activities, it's best to wear ___casual clothes.

我通常穿休闲装，比如T恤和牛仔裤。

I usually wear ___casual outfits, such as t-shirts and jeans.

许多餐厅在午餐时间允许休闲着装。

Many restaurants allow ___casual attire during lunch hours.