I'm starting my third week at my summer internship and it's been so fun. I'm having fun with my wardrobe as well, I've been pairing different tops with Loft's skinny ankle pants in the Julie fit. these pants. I love them because they're relaxed through the hip/thigh and tapered at the ankle. I'm wearing a 2 regular. The pants are quite fitted in the smaller sizes, so if you're in-between sizes, size up to be office-appropriate. I find that I am most productive at work when I'm comfortable and confident in what I'm wearing. Here are some other pairings I came up with:
This floral easy care cold-shoulder flutter sleeve top got lots of compliments when I wore it. Double check your office dress code to make sure you can show some shoulder though.
Here's a more relaxed, "just walking my dog" pairing.