They have their place if you are diving in a dry suit for an extended time. If you are diving in a wet suit they would not be needed for obvious reasons. Scuba diving can dehydrate you from breathing the dry air in the scuba cylinders, so hydration is a must.
you go to the mayor and she gives it to you
You mean a scuba suit?
Many people use a SCUBA suit for diving. Sport divers, police divers and some Navy recovery divers.
Both it was Jacques Cousteau and Emile Gagnan who invented the modern scuba gear in 1942.
There are many accessories which can be considered must haves for scuba diving. One should have a swimming suit, goggles and breathing apparatus in order to dive effectively.