YSL smoking suit
Pretty sure I know the suit you mean ... you lucky woman!
Can we have a photo of the quiff, please? 
OP, I'm of the "wear what makes you feel good about yourself" persuasion. But since you asked, I don't think that blazer goes with the jeans. A longish, loose shirt might look more stylish, and also help you feel less vulnerable. Jazz it up with shoes and accessories.