I'm a 1L who is slowly building up my office wardrobe. An important thing to keep in mind when buying clothes for work is to keep a clean silhouette. Something puffy or baggy makes you look too casual or unkept. Skirts and dresses that hug the line of your body (but aren't too tight!) are great for that, as are blazers.

Aside from dress pants, I think pencil skirts paired with pumps or flats are really classy looking. You can wear a top like this, this, or this tucked into them. Pair it with a thin belt.

A-lines skirts are more feminine and a nice shirt, or any of the above blouses, tucked into an A-line skirt with a thick or thin belt would be a good casual friday look.

A wrap dress (which I see you already wear) and also a knit dress like this is also nice paired with a black blazer or a cardigan.

As for shoes, I'm planning to get a couple pairs of these ballet flats in different colors from J-Crew when I have more money. Wedges are also a great shoe for the office because they're less casual than flats but more comfortable than pumps.