Cavalier- A lot depends on hunt. Tie and shirt are definitely more "old timey" as JSwan said. However, the new club my barn just joined, they like to see the ladies out in tweeds with colored/patterend stocks (or so I'm told by the lady I ride for).
Tomorrow will be the first time I've had the luck to go out during the weekday... I'm wearing my black coat and stock tie... I forgot to ask my husband what the ladies were wearing last Monday when they hunted on our farm.. I had other commitments so missed it! Better I'm safe than sorry!