For a look that's pared-down but can be styled in a great deal of different ways, dress in a black leather biker jacket and blue jeans. Infuse some casualness into this look with athletic shoes.
Blue Jeans with Athletic Shoes Warm Weather Outfits For Women
Consider pairing a grey knit open cardigan with blue jeans for a casual outfit. Introduce athletic shoes to your getup to give a touch of playfulness to this ensemble.