Fashion trends are circular, with so many styles from the past being repeated years, or sometimes decades later. Vintage design aesthetics often inspire new generations of designers and stylists to incorporate retro elements into their looks. The older garments that inspire these trends are often still in circulation. And tracking them down is a great way to keep your style up to date - at a fraction of the cost - and with much less of an environmental footprint than buying something new. Here are three retro-inspired trends you can source second-hand, and ideas for how to style them.