Put plainly, a business-friendly dress shirt is all about making that impression a strong one. It’s difficult to be overdressed in business—in fact the opposite is usually the biggest worry, especially for recent graduates and new hires. But there are also subclasses of business attire, sometimes stated explicitly during an interview and sometimes left up to the interviewee’s powers of perception. Generally, the more formal the environment the more conservative the attire. The classic white dress shirt is always a safe choice here, especially when paired with a tie and a dark suit.
If you want to introduce some personality without alienating prospects or fellow employees, stick with pinstripes or even micro checks. These subtle patterns are widely accepted at every level of the business world, but be sure to keep them grounded with conventional colours like blue and white.
Fabric also dictates a dress shirt’s position on the formality scale. You don’t necessarily need the polish of royal oxford, but do try to stay within certain boundaries. Broadcloth, dobby, twill and pinpoint oxford fabrics will serve you best.