Since it is on the equator I presumably only need a 3mm shortie – right?
Not necessarily! Be sure to check out what exposure suits we recommend for the destination you are interested in. We have known of people making that assumption on a Komodo liveaboard safari only to find themselves aborting dives due to cold upwellings giving them an instant ice-cream headache. Not nice when all your friends are enjoying diving with playful mantas from the warmth of their thick suits!