To protect your body

When you go scuba diving it's best to always wear a dive suit. Whether you wear a drysuit, a wetsuit or a shorty depends on the conditions of the water in which you're diving. Diving in tropical water doesn't ask for a drysuit and if you would like to do an ice dive you don't want to get cold too soon, so a shorty or wetsuit isn't a good idea then. There are lots of different wetsuits and drysuits and there's always a suit that suits your wishes and needs. A lot of information can be found on the internet and doing a little bit of research before you buy your suit might be a good idea. You want to have a suit that really fits you and custom made can be a really good solution.