The look was basically the iconic costume, but the gloves were gold. I'm not sure when the change got made.
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As far as Earth-2 goes, I don't know if Aquaman was ever part of anyone's continuity until the first JL story in The Brave And The Bold #28. AFAIK, Aquaman's only appearance as an E2 character came near the end of Thomas' All-Star Squadron...
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...then he was promptly wiped from continuity. There is a sound argument for the two being distinct characters because Aquaman's origin was passively retconned somewhere along the way. His original origin had him as the subject of his father's experiment. That got overwritten when Aquaman first encountered Atlantis.