HSK 7-9
礼服
lǐfú名
ceremonial robe; formal attire (dinner suit, evening gown etc)
她穿着深蓝礼服参加晚宴。
Tā chuānzhe shēnlán lǐfú cānjiā wǎnyàn.
She attended the dinner wearing a dark-blue formal gown.
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Appears across levels (7-9) in the HSK 3.0 word list.