The Hanszo Horse Rash Guard took about 3 months to design working more than full time. Here is a glimpse of the first concept sketches done in the ideation phase of the design, with the final packaged rash guards in tubes standing behind the sketchbook. On the right hand page you can see that the first mask idea was more skeletal and the Horse head drawn in underneath.
You can see how this initial sketch evolved into the final design below:
Master the Art,