Short answer
For a casual wedding, choose smart separates like a linen or cotton shirt with chinos or tailored trousers, or a relaxed suit without a tie. The key is to look put together but comfortable, matching the venue and the couple's style.
A casual wedding gives you freedom, but you still want to look like the groom. Start with a well fitted shirt, perhaps in a soft colour like white, pale blue or a subtle pattern. Pair it with chinos, tailored trousers or smart jeans if the wedding is very relaxed. Add a blazer or a lightweight jacket in a neutral tone like navy, beige or olive. You can skip the tie or wear a knitted tie for a bit of polish.
Shoes matter. Clean leather loafers, suede desert boots or smart trainers can work, depending on how casual the wedding is. Avoid scruffy trainers or worn out shoes. Accessories like a pocket square, a nice watch or a simple boutonniere can lift the outfit without making it formal.
Think about the season and the venue. A barn wedding in autumn might call for a tweed jacket and boots. A garden wedding in summer might suit a linen shirt and loafers. If the wedding is outdoors, bring a layer in case it turns chilly. The most important thing is to match the couple's dress code. If they say casual, that is permission to be comfortable, but still dress as if you are hosting a celebration. You can always ask the couple or the best man for guidance.
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