COHASSET — Like a certain other “American Idol’’ runner-up, Adam Lambert has a voice of profound technical ability and a fan base driven by a fervent devotion that even the person who actually won couldn’t match. But where Clay Aiken spent the first few years of his career letting his fans dictate his image, Lambert is letting it all hang out right from the start. At the South Shore Music Circus on Friday, he was confident and flamboyant.
Maybe “flamboyant’’ doesn’t quite cut it. He came out in full plumage, almost literally, with a top hat wrapped in purple fishnets and a fistful of feathers, a fringed purple jacket, and a smear of glitter running from his left eye to behind his ear. He would have been hard to miss even from the farthest reaches of an arena, which the performance seemed designed for.