designating, of, or suggesting a style of an earlier time that has been revived: said of clothing, hairstyles, etc.
See retro in American Heritage Dictionary 4
(rĕtˈrō)
adjective
Retroactive: retro pay.
Involving, relating to, or reminiscent of things past; retrospective: “As is often the case in retro fashion, historical accuracy is somewhat beside the point”(New York Times).
nounpl.ret·ros
A fashion, decor, design, or style reminiscent of things past.