Like a majestic beast calling out to the other sea creatures, just putting on this beautifully-patterned shirt sends out a series of clicks and whistles to let everyone know who runs these waters. After all, don't be a big fish in a little pond when you can be a blue whale in a big ocean.
Are we mixing metaphors? Maybe. But what do you care, you're just here to have a whale of a time in a whale of a shirt.