Banana Leaves: Inwards or Outwards?

I had Indian food for lunch today with my parents at the Old Andersonian Club, just next to Anderson School. It wasn't the best I've tasted, but it surely beats the usual stuff I take in Singapore. At the end of the meal, we folded the banana leaf because we learnt this is customary when eating off banana leaves.

The problem was, my and my mom folded our leaves inwards while my dad folded it outwards. Noticing this, we went into a small debate on which direction is right. My friends thought me to fold it inwards while my dad's friends taught him to do it the other way. As we couldn't come to a conclusion, we observed the other tables and they folded theirs inwards.

Unsatisfied, my dad asked one of the waitresses which way is the correct one. Response: Fold outwards. RESULTS: No conclusion.

I decided to do a bit of research on this issue and couldn't find any concrete sources on this yet. Hence, if anyone knows anything about this or has sources that I can look at, please let me know. I'll be glad to know the truth.

I'll be back with more once I get more research material. Probably by that time, I would've managed to solve this problem.