Cotton up, denim down

Top: Outerwear-Men's button up shirt from cotton on, men

Inner wear-cotton black dress from cotton on

Bottom: Denim shorts from Levi's

Others: vintage bag from chivus

For a more vintage look, end with a pair of vintage boots, or for a classy look, go with a pair of black flats with a classy hat. For a more outgoing look, wear it with snicks/sandals.
Never ever underestimate a vintage bag.