From the Connecticut March 2024 Boaters Guide:

Connecticut Life Jacket and Personal Flotation Device (PFD) Laws. There must be a wearable life jacket for each person aboard every vessel in Connecticut. Each life jacket must be readily accessible and properly fit the intended wearer. Life jackets must be worn by anyone in or operating a manually propelled vessel from October 1st through May 31st.

In addition, life jackets must: Be U.S. Coast Guard approved, Have a legible label, Be in serviceable condition, meaning all straps, buckles, seams, and material are in good condition, intact, and able to perform.