Short answer
There are no new legal rules for what guests must wear to a UK wedding. The dress code is set by the couple and shown on the invitation.
Guests do not need to follow any law or official rule when choosing wedding outfits. What you wear is guided by the couple's wishes, which they share through the invitation wording or a wedding website. If the invitation does not mention a dress code, it is usually safe to wear smart casual or a suit or dress, depending on the venue and time of day.
Some couples choose a theme or colour palette, while others prefer a relaxed look. If you are unsure, it is always kind to ask the couple or a member of the bridal party. They will happily tell you what they have in mind. Remember that cultural and religious ceremonies may have their own expectations, such as covering your head or shoulders. In those cases, follow the guidance from the place of worship.
The most important thing is to be comfortable and respectful. Choose clothes that suit the season, the venue and the length of the event. Avoid anything too casual like trainers or shorts, unless the couple says otherwise. You want to look like you have made an effort without upstaging the couple.
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