If you have any interest in beauty and fashion, you know that trends always seem to come full circle, and over the past few weeks at the spring 2011 shows we’ve seen the ’70s taking over the runways. Many of us tend to stick to one decade, but some get bored and dabble in a few. So just in case you want to expand your horizons (or want to finally jump on board with the Mad Men cast), we’ve broken down the trends of the past 6o (yes 60!) years. Let us know which decade you covet in the comments section below.