Fred Jones in Scooby-Doo #9

 Back when Marvel made Hanna-Barbera comics, the mystery for this issue is Mystery Inc. fighting off a surfer ghost, with some help with the cast of Captain Caveman (one of Scooby-Doo's many clone shows).  

They start at the beach, with Fred rocking a bright blue speedo. Oh I'm in love *fans self*. He and Scooby go surfing, until they are attacked by a poor man's Iceman costume. 

The gang go investigate around, and see a trio of hunky surfers in speedos (Fred's still hotter). And learn from this weaseley guy about some surfing videos, involving a cave.  

So Mystery Inc and the Teen Angels go investigate the cave, and get attacked by the Surfer Ghost. Captain Caveman is captured by accident. 

I love that shot of Fred walking. I love him so freaking much. The gang go investigate further with Rowby, and later find the outfit. Fred is wearing a shirt but one panel shows he's just wearing a speedo underneath. 

Spoilers, but the gang (or Fred) figure out it was Rowby as the Surfer Ghost, and the two teams celebrate on the beach. 

It's very worth noting Fred is a speedo/briefs guy in other media too! Ah I'm just so obsessed with this blonde himbo.