You need a piece of cording or thin rope for this exercise. The cording is covered with a bias strip/tape which creates the piping. Piping is used as a decorative element which is commonly seen on collars and pockets. These courses are designed for learners planning to go into the fashion/apparel production environment. Purchase the patterns for Level 1 tutorials here: https://tinyurl.com/AAA-L1-Patterns
