Thank you for your review of the Men's Pilot II Waterproof Guide Rain Jacket. We appreciate all feedback that we receive from our customers as this helps us understand how we can make improvements to the design of our products. This jacket is designed to be worn over your regular clothing, however if you are wanting to wear this over your flotation vest, we would suggest checking the sizing chart on our website to see if the measurements on the next size up would accommodate the use of the vest underneath. If you would like to contact customer service, we will be happy to try to help you find a jacket that will better suit your needs. You can reach us at [email protected]. Please reference Case # 351113506 in your email.