For a consulting interview, err on the polished side even when the interview is virtual. You do not need to make the outfit the focus, but it should look professional on camera.

Virtual format changes the setting, not the fact that this is a formal recruiting interaction. Dressing slightly more formally is usually less risky than appearing too casual.

A clean shirt or blouse with a blazer is a safe default for many virtual interviews. The exact choice can vary by office and local norms, but avoid clothing that would feel noticeably casual in a professional meeting.

Check any instructions from recruiting, choose a simple professional outfit, and test how it looks on camera with your lighting and background before interview day.

I'd rather be slightly overdressed than wonder about it for the whole interview.