Going from average high school student to America’s singing sweetheart requires a certain wardrobe adjustment. So you may have noticed when Jordin Sparks, who wore an affordable dress on last week’s American Idol, stepped it up last night in a custom-made designer frock by Badgley Mischka. Longtime fans of the show, Mark Badgley and James Mischka honed in on Jordin early on. Badgley tells PEOPLE, "We kept thinking, ‘That’s a beautiful young girl; she would look amazing in our ...