The fish don't care what you wear. Waders, vests and hats for fishermen are necessities to brave the elements.
Waders are a must if you are planning any surfcasting or stream wading.
A tacklebox or a tackle bag is a necessity to store your fishing lures, bobbers, and hooks.
A tacklebox is a necessity to store your expensive lures. The more you fish the more expensive lures you will accumulate.