If you intend to wear the dress, you cannot lend it to someone. You had the intention in the past to wear it -you were going to wear it. You are not now going to wear it.
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AnonymousI can lend you this dress later although I was going to wear it this evening.It needs something like "later".
AnonymousI will wear it this eveningThis won't work. "will" makes it sound to me like a spontaneous reaction to something else.