Hercules, the Lion of Olympus, inspired by the 1980s run of Avengers by Stern, Buscema and Palmer.
I believe that John Buscema also designed this particular outfit. Since he liked drawing Conan comics very much, it’s not a surprise that Herc was his favorite Avenger. (Or the one he hated the least when drawing all those damn Avengers).
Here’s my tribute to the whole line-up from that run.