This file, in the meticulous detail characteristic of the dp studio method, demonstrates how to construct the following collars from a base pattern: Peter Pan, Roll and Bertha. Each step of the working process is detailed and explained step by step in the predefined size of your choice for a full understanding and top-of-the-range result. The base pattern is your starting point for making any of the three collars and is transformed differently, depending on the collar you have chosen to construct. This base has the advantage of allowing various transformation possibilities. This file can be worked in parallel with the following: The technical file of the classical blouse base pattern The technical file of the blouse sleeve base pattern The technical file of the simplified blouse sleeve.