On days that require a quick day-to-night change up, pairing a silk shirt with a pencil skirt is one of my favorite quick and dirty combinations.
During the day, I keep the jewelry to a minimum and my buttons tightly bound. After hours, I layer on the jewels, roll up my sleeves, strategically untuck my shirt, pull out a sparkly clutch and hit the town.
There's really nothing simpler. Hope you like the transition.