Was nightie gift more than neighborly?

You need your wife's permission to express a point of view about this gift. Your neighbor's statement leads me to think that -- in his stated intent, anyway -- this negligee was a gift to both of you. I agree that this is in poor taste but think you should start by giving your neighbor the benefit of the doubt.

He may hand you an opening when he asks if you "enjoyed" this gift. You can say, "Stan, I've got to admit, I am confused by your gift. I don't like the idea of men other than me giving my wife negligees; honestly, it makes me uncomfortable." You and your wife need to learn that age-old dictum about fences and neighbors. Relationships thrive when the boundaries are clear and respected.