The skirt, with anything ranging from a plaid button-up, to a layered sweater, to a plain t-shirt tucked in. Throw on a blazer, cardigan, or light-weight jacket for cooler months.
Next is the dress, conservative and easy to move around in, dressed up with a blazer or bow-tie, or a more casual maxi with a belt.
And you can't forget pants, either for casual friday or everyday days. Love the scholarly argyle socks with comfy loafers, scarves are a must, and I'm not usually a fan of matching pantsuits, but the one below is delightfully undone.
(photos collected from inhonorofdesign, lolobu, workdayweekend, citizencouture, classygirlswearpearls, alittledashofdarling, cindispivey, simplybikeblog, vanessajackman, and chictopia)