Add a 60s vibe to your outfit by adding a Peter Pan collar to an old cardigan with this guide from Gok Wan, as seen in Gok's Clothes RoadShow.
A Peter Pan collar is a rounded collar that sits on a crew neckline. Buy some ready-made collar motifs from a haberdashery store.
The motifs are designed to go around the collar. Place them on the neckline to see how they fit and pin them in place.
Sew the motif to the collar.
Using pointed scissors, cut through the mesh to form a button hole. Push the button through the hole.