She is wearing an evening gown.<=>She is wearing a nightgown. 她穿着一件晚礼服。她穿着一件睡衣。
Clothes, such as pajamas or a nightgown, worn in bed. 睡衣睡觉时穿的睡衣或睡袍
She is wearing a nightgown. 她穿着一件睡衣。
Scarlett, peering at her sisters in the dim flaring light, saw that Carreen wore a nightgown, clean but in tatters, and Suellen lay wrapped in an old negligee, a brown linen garment heavy with tagging ends of Irish lace. 思嘉在昏暗的灯光下凝望着两个妹妹，看见卡琳穿一件虽然干净但已破了的睡衣，而苏伦只裹着一件宽大的旧便衣躺在那里，那是一件棕色亚麻布袍子，上面还留有许多爱尔兰花边的残屑。
She told me that I shouldn't wear a nightgown to school, that in America people only wear nightgowns to sleep in ! 她告诉我不行穿睡衣来学校,在美国的人只有睡觉才穿睡衣!