Christopher Strong (1933)

At a party for Bright Young Things, a "treasure hunt" for attractive yet virtuous people nets Sir Christopher Strong, M.P., and Lady Cynthia Darrington, dashing aviatrix. Their acquaintance is innocent at first; but after he sees her in a spectacular silver moth costume, virtue begins to wane. Against their wills, they are drawn into an affair whose consequences threaten Strong's happy marriage and both their careers.