Wool, especially a wool that is lightweight, is probably the best choice since it breathes well and rarely wrinkles. Avoid the trends. Flashy clothes tend to attract attention and distract many people. Choose clothing that is more sensible and toned down. Shoes should be polished, clean and not run down at the heels.
People often judge others on the appearance and condition of footwear.
Generally black shoes go best with blue or gray suits whereas dark brown shoes match best with tan suits. As for colors, avoid bright ones. Neutrals are the best for work. Gray, blue and taupe are all excellent choices. Never combine more than two colors in one outfit.