The visual results in the 3D window and the render preview interface do not match.

Question: The reflection effects of the same fabric are different between the 3D window (real-time) and the render preview interface.

Answer: The lighting effects in the 3D window (real-time) and offline rendering are inconsistent. Fabrics with metal maps and smooth maps appear more metallic and smoother when viewed in the real-time 3D window. To achieve a result closer to the offline rendering, you can enable ray tracing in the top-right corner of the 3D window and use the same lighting setup as in the offline render.