Here is a guide to the dress code for livery events
White tie, long dresses for ladies. Black tie is acceptable.
Black tie, cocktail dresses for ladies. Apprentices who don't have a dinner jacket may wear a suit and tie.
Informal, no ties required.
No dress code.
This is mainly casual dress. There is usually a dinner where the dress code is either lounge suit or black tie. Full details are given when you book.