And, it's also well known that wearing a swimmer's belt when out paddling a kayak, is better than removing the pfd and placing it within the kayak because it was uncomfortable or too warm to wear while paddling.
When someone gets tossed into the water while wearing a pfd, it will ride up around one's head, and it is not designed for swimming, while the buoyancy of a swimmers belts is centered so it encourages swimming, plus it can easily be moved from one's waist to armpits to adjust the buoyancy. Try doing that with a pfd?
With a swimmer's belt, a 'poor swimmer adult' can jump into the water and swim for 100-yards along the shore in water that's six to ten feet deep, or shallower, or whatever, and feel pretty secure about that. With a pfd, you just go nowhere and no one seems to don a pfd and jump into the water. A pfd is probably considered to be a flotation device and not a swimming tool.
www.parafunalia.com in Gilford, $24.95, s-m-l-xl, one buckle or two buckle and if you do not like the bright yellow color, then a spray can of Krylon Fusion in flat grey or camo khaki will easily change the color permanently. Suggest you get the one buckle model in the largest size!