Short answer
The dress code for an engagement party depends on the venue and time of day. Usually it is smart casual or cocktail. Check the invitation for clues, and when in doubt, dress slightly smarter than you think you need to.
Engagement parties in the UK vary widely. A garden party in the afternoon will feel different from an evening do at a nice restaurant. The invitation should give you the best clue. Look for words like casual, smart casual, or cocktail. If it does not say, ask the couple or the host directly. That is always acceptable and shows you care.
For smart casual, think smart jeans or chinos with a shirt for men, and a dress, skirt, or smart top and trousers for women. For cocktail, men might wear a suit without a tie, and women a dress or a smart jumpsuit. Avoid anything too formal like black tie, and avoid anything too casual like tracksuits or beachwear.
Consider the season and the location. A barn or marquee might be more relaxed, while a hotel function room might be smarter. Comfort matters too. You will likely be standing, chatting, and maybe dancing, so choose shoes you can manage.
If you are still unsure, it is always better to be slightly overdressed than underdressed. You can always take off a jacket or dress down with accessories, but you cannot easily dress up if you arrive too casual.
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