In the Club House, Minimum requirement:
Clean smart casual and appropriate for the occasion.
(As would be defined by a majority of reasonably minded people)
NB: Beach style Flip Flops are not permitted.
On the Course:
Any recognised golf clothing/shoes.
(If you are unsure about your golfing attire, a good indicator to what is acceptable is any clothing/shoes that can be purchased in the Pro Shop)
Mobiles phones should be switched off, both on the course and in the clubhouse