This is an outfit I wore in college, albeit without the heels, I usually wore it with flats, but I re-purposed it for a day at work. It's very comfy, and still looks pretty professional. A blazer could be added to dress it up more, or different shoes or a scarf could change the look.
Shirt: Target (old) It's one of my favorites and I wish I had bought more.
Skirt: Target (old)
Necklace: Target (old) Similar here
Shoes: Nordstrom (old) Similar here