People have asked for office-appropriate frum fashion choices. Really, frum clothing lends itself easily to the office environment. (Women's suits may be a very different story, based on the standards of your community.)
After more than a year at my prior job, my co-workers (who were also my classmates and friends) hadn't realized that I wear skirts full-time. They also didn't notice that I am shomer negiah. Instead, they thought I was just "classy" and professional. Maybe they're just blind, but I don't think modest dress and behavior should be in-your-face. I think that would actually be immodest, not to mention the possibility of embarrassing the other person. But, as in all things, opinions and halachic rulings differ.
This applique 3/4 sleeve sweater is from Nordstrom Rack. The skirt is a plain black suit-material skirt, like you would find on any self-respecting seminary graduate. The shirt underneath the sweater is a sleeveless tan shell. It's also made from sweater-like material. I've owned it so long that I'm afraid I don't remember where it came from.
I'm not wearing shoes in that picture, but I would recommend that shoes complete your office attire. However, I can only recommend heels of a reasonable height, which I believe is a maximum of 4 inches. Any more than that, and you are walking with tiny steps and look like you have a watermelon between your knees. No one, and I mean no one, can walk properly in high stilettos. Not to mention drawing inappropriate attention, which is what hooker heels are intended to do. In the office situation, flats or heels of 1-2 inches ("kitten heels") are both appropriate and flattering. That's your unsolicited fashion advice for the day.