Professional business attire should convey your credibility and competence, but also reflect some personality without going overboard. It is important to understand your office's cultural norms for both business casual and "client-ready" days, as standards differ across states, occupations, and offices. How you should dress in your office is largely dependent on your company's dress code and the cultural norms of your office. Companies usually issue employee handbooks with formalized dress codes, and that is also a good starting point to understand what is appropriate to wear in your office.