white mourning dress

1. She is in a white mourning dress.
    她身穿素服。

2. White had never been taken as the color of official robes because of the practice of being the color of mourning dress.
    白宫从来没有带颜色的长袍，因为官方的习惯做法，采取洁白颜色的丧服。

white mourning dress的意思

3. She was in white mourning dress.
    她一身缟素。