you lost me at wearing a suit...
as a rule, you never want to be under-dressed when meeting with people who you want to give you money. being wrong on this even once could cost you money, possibly a great deal of it.
if you show up in a suit and tie and everyone else is wearing sandals, the proper etiquette is to say "mind if i remove my tie?" and then remove your tie and jacket and unbutton your first shirt button.
instant business casual, which mixes fine with sandals. this also demonstrates social competence which may or may not be a factor in your hiring.