For men, a dark suit is always a safe choice. A white shirt and black tie are also standard formalwear options. For women, a little black dress is always a good option, or you could choose a dress in a more subdued color like navy or olive green. Avoid bright colors and loud patterns. When it comes to shoes, men should wear dress shoes, while women can wear pumps, flats, or sandals ( with straps or ankle ties, not metal or plastic). At a smart casual event, it’s best to dress up a little bit from what you would normally wear. This could mean wearing a dress shirt and tie for men, or a blouse and skirt/trouser combo for women. Smart casual is usually more relaxed than formal attire, but it’s still important to look polished and put-together.