LPT Request: are there discrete floatation devices out there?

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The original was posted on /r/lifeprotips by /u/Seethi110 on 2023-06-27 20:23:08+00:00.

I’m going to spend 4th of July at the lake with my girlfriend’s family, but I am also a terrible swimmer. I was hoping to find something like swimming trunks with air pockets or something built in, but was disappointed to find that those don’t exist.

Is there anything else I could buy that is discrete (ie not a life jacket) that could help me be more buoyant in the water?