Take your casual look up a notch in a sleeveless button down shirt and a light blue eyelet midi skirt. Add loafers to the mix to make the outfit slightly more refined.
Sleeveless Button Down Shirt with Loafers Smart Casual Outfits For Women
For something on the cool and casual side, consider wearing a sleeveless button down shirt and white and black plaid tapered pants. A pair of loafers will introduce a refined aesthetic to the look.