For men, dark-colored suits are preferred (dark grey and dark blue). Along the coastline the attire is more casual and colorful. For women, a suit or dress that is conservative. Again, dark colors for inland, lighter colors along the coastlines.
Here is an example of a basic suit. It's simple yet classy. Do not forget the tie clip! A floppy tie is enough to bring your whole look down. Also, a fitted shirt is key. You don't want to look like you are swimming in your clothes.
Men's Navy Suit, Light Violet Dress Shirt, Black Leather Derby Shoes, Navy Tie