A Classic: the Carolyn sweater in Navy.

It's hard to beat a simple navy sweater for utility and function. Add in the style quotient and what is there not to love about this Egyptian cotton layering piece from Emerson Fry? 

Pull it on with jeans, linen trousers, or any kind of bottom. Or try it layered over a dress for cooler summer evenings. 

Drop panel in the back provides a bit more coverage.