For realism in a Bigfoot costume, it is easier to attach a couple of breasts than to simulate the male tacklebox and some sort of muscle definition in the chest. Patterson, to his credit, did a good job but the breasts are uniformly hairy (ie hairy all over even underneath) which does not appear to occur in nature.
And you'd be surprised at the lengths some people go in order to have some fun at the expense of others. People like Wallace and Patterson redfined a genre of folk-entertainment that is still going strong today. Their names live on after their deaths and will do so for a long time to come. The real prize of Bigfootery is to weave one's name into the tapestry of a legend thereby becoming legendary in one's own right.