So that the scuba diver could go more streamline in the water.
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.
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.
I do not think you can change i at all.
You need to ask the guy in the petting zoo :)
late 15th century