I don't think he jumped on the retro trend, though. He's been doing it since his debut in 2010 - it's just an integral part of his image.
I actually think his success was one of the main overall influences for the trend taking over pop music in 2013-2014.
Tell them sis, funny thing that everybody thinks bruno just jumped into the retro style when he's been doing it since 2010 and like you said he kinda brought it back especially the Pompadour hair style but for some reason ATRL always tries to denies it.