Wait! Wait!! Here's the ticket!!! Thin enough to let you swim comfortably, thick enough to hide the fact that you're smuggling raisins!!!!
http://www.swimoutlet.com/product_p/1778.htm
In all honesty, a standard lycra suit would probably be just as good but these things are cool! Maybe too much for 80-deg water though.
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Fredo, you're my older brother and I love you...but don't ever take sides, with anyone, against the family again...ever.