Sixty is a unique age, just as the decade was. A gallon of gas in 1960 was only a quarter, but you can’t buy much with just a quarter these days. Still! Pulling out the bold colors for someone’s 60th and making this the theme isn’t a terrible plan. With the population split between tie-dye clothes with hemp jewelry and sharp suits with A-line dresses, there’s a whole host of colors and clothes for guests to pick from.
Some of the easiest for modern-day wardrobes might be the Hippie style, since the men can throw on bold colored shirts and bluejeans and the ladies likely have a summer dress somewhere. Throw on some bangles and a bandana, sketch a peace sign on the cake, and no one will be any wiser. If you do that, why not go all out? Recycle everything.