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in mufti
in mufti 是固定搭配，表示“穿便服”，尤指军人或警察不穿制服。另：mufti 还可指“伊斯兰教法学家”，此时为可数名词，复数形式是 muftis。
The officer was in mufti at the party.
这位军官在聚会上身着便服。
便服；常服
先理解核心含义，再看它在真实句子里的用法。
便服；常服
civilian clothes, especially when worn by a person who usually wears a military uniform
The officer was in mufti at the party.
这位军官在聚会上身着便服。
能够发布教令的穆斯林学者和伊斯兰教法解释者。
A Muslim scholar and interpreter of sharia law, who can deliver a fatwa.
For the party, the officers were told to come in mufti rather than in uniform.
派对当晚，军官们被要求穿便服而不是制服。
After the parade, the general changed into mufti and went shopping without being recognized.
阅兵结束后，将军换上便服去购物，没人认出他。
The soldiers enjoy wearing mufti on their days off, even though they usually wear uniforms.
士兵们休假时喜欢穿便服，尽管他们通常穿制服。
in mufti 是固定搭配，表示“穿便服”，尤指军人或警察不穿制服。另：mufti 还可指“伊斯兰教法学家”，此时为可数名词，复数形式是 muftis。
The officer was in mufti at the party.
这位军官在聚会上身着便服。
change into mufti 强调从制服换成便服的动作。
He changed into mufti after the ceremony.
仪式结束后，他换上了便服。
Not this
The general attended the ceremony in a mufti.
Use this
The general attended the ceremony in mufti.
当 mufti 表示“便服”时是不可数名词，常用于固定短语 in mufti，不加冠词。将 a mufti 改为 mufti 才符合英语习惯。
Not this
The two mufti disagreed on the legal question.
Use this
The two muftis disagreed on the legal question.
当 mufti 表示“穆夫提（伊斯兰教法说明官）”时是可数名词，复数形式为 muftis。句中指两位穆夫提，应用复数 muftis 而不是单数 mufti。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
穿便服（多指军人等不穿制服）
The officers usually travel in mufti to avoid being recognized.
这些军官出门时常穿便服以避免被认出。
大穆夫提（伊斯兰教高级法律权威）
The Grand Mufti has issued a new legal opinion on the question.
大穆夫提已就这一问题发布了新的法律意见。
穿着便服
The colonel turned up at the party in mufti.
上校穿着便服出现在聚会上。
Use mufti naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
音似“穆夫提”，想象一位穿便服的伊斯兰学者：mufti既是法典说明官，也指军人穿的便服。
语域：mixed 常见场景：军事/着装语境、伊斯兰教法语境 mufti 有两个主要含义：作“便服”解时多用于军事或正式着装语境，通常带有正式或旧式色彩；作“穆夫提（伊斯兰教法典说明官）”解时是正式职称。选择词义时需依据上下文语境。
指‘伊斯兰法典说明官’时可数，复数用 muftis；指‘便服’时不可数。
Dictionary facts from ECDICT, WIKTIONARY.