I use Sterns, West Marine, and an Onyx belt pack when it's hot out. Also had one deploy in a hot, wet storage locker. I fish mostly alone and never ever leave the dock without using one. I agree the best thing to do is try a few on at the store and fid the one that fits you best. They are pricey, but how much is your life worth?? We spend thousands on fishing equipment, then complain about the price of life jackets....... At least wear a belt pack if you don't like the vest style.
Here's a video of the belt pack I use when it's too warm to use a vest.
https://www.youtube.com/watch?v=DB1K2wJC8Vc