Sulus and thongs were compulsory. No need to panic - thongs are sandals not a type of underwear.
The food is cooked in an underground oven and served as a buffet.
The highlight of the evening was the 'dancing' that came afterwards.
The staff partner each guest and teach you how its done. Even the most reticent gets no choice and soon we were all being whisked round the room almost at a run to loud shouts of 'forward' and 'backwards' as they change direction on a whim. There doesn't seem to be any rules and no-one is left out even if it means 3 people 'rushing' round together.
Luckily we were allowed to get our breath back in between while the staff treated us to music and a song.