In last week's Super Friends #27, the heroes end up visiting Superman's arctic Fortress of Solitude, and artist J. Bone gives Batman and Aquaman special, customized cold-weather versions of their regular uniforms. You know they must be pretty toasty, because even though the heroes are at the North Pole they're smiling so contentedly: (I like how Aquaman's hat matches the color of his hair perfectly, by the way).
Here's another panel of their uniforms, this one allowing you to see the pants as well:
Looking sharp, guys.