You have to define "formal" in the context

来源: boss1010 于 2015-03-18 15:46:44 [] [旧帖] [给我悄悄话] 阅读数 : (162 bytes)
回答: 要参加个正式晚餐，着装请教？ 由 JohnsonJohnson 于 2015-03-18 11:09:31

No worry, if that is real format, you should get a formal invitation to outline proper dressing.
Otherwise, it is just that formal in a way they call it.

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