This is a 'teaching pattern'. This pattern teaches you how to make a properly fitted mask. Since every face is a little bit different, this pattern also shows you how to measure and adjust masks to fit properly. Using dolls.
Pattern also includes handy links to human-sized resources at the end like studies on fabric filtration efficiencies, in case you happen to be interested in applying the skills you learned from playing with dolls elsewhere ;)
Thank you for the pattern, It‘s great!