thrift store top: 80 TWD (2.42 USD)
black turtleneck: 100 TWD (3.33 USD )
my trusty old "Giordano Khakis": about 300 TWD (9.09 USD)

Here is the outfit with a grey turtleneck ...




You could possibly do this to any shirt with an over-sized collar. Pinch an inch, sew it at the top, fold it over and tack a big button on it ...