Yes, it is normal to wear a wetsuit over a trisuit while swimming in a triathlon. With the wetsuit, you want to be able to keep bouyant and maximize your swimming ability to gain time and with the trisuit underneath, you gain more time in transition 1 since you are completely dressed for the rest of the race.
In a triathlon, it's important to save time. Wearing a wetsuit over the triathlon suit is a way to do this. To learn more about training and preparing for a triathlon, whether you are a beginner or a pro, check out this site: giddyup-triathlon-sports.com.
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