The gimmick for making Brutus Beefcake into a barber came from Pat Patterson.
Why?
Because Pat's ex-boyfriend, who had committed suicide, was a hairstylist.
http://www.rspwfaq.net/2013/12/kayfabe-commentaries-timeline-series_19.html
When Beefcake is asked about how the gimmick was created. Beefcake laugh and said he could never figure out how it came about. Beefcake brings up Pat Patterson and how he had a weird sense of humor. During this part, he brings up how Patterson and even Vince were big on being subtle. He then goes into how his “Barber” gimmick came about from his “sick sense of humor.” Brutus said that Pat’s boyfriend Louis, who was a hairdresser that actually ended up hanging himself. Beefcake then talks more about the Barber gimmick and how it was unheard of at that time, because a hair match was usually only done once a year. Sean goes with this and asks if that added to his popularity. Brutus said that he took it to another level and that it was never done before. He also said that he had no clue that it was going to happen. During the TV tapings inRochester shortly after WrestleMania III, Brutus was handed a white coat with scissors and a comb then was told he was going to be “The Barber.” Brutus’s first response was “fukk you” when approached with the gimmick and he was freaked out because he believed that prior to that, he made himselfa “household name” and the crowd loved to hate him. Brutus then says that no one knows this but he went nuts backstage, kicking the lockers and breaking stuff, threatening to quit over the gimmick that he believed was going to kill his career. Brutus says that the gimmick was created by Patterson to fukk with him and since he was Hulk’s friend and he couldn’t fukk with the top guy, he was the target. Sean asks why and Brutus says that Patterson was jealous of them. Brutus then said in the midst of his tantrum, Hogan went over to him and said that when you go into the ring, you put them out with the sleeper then cut their hair. Brutus thought about it and said if he did that everytime he went out, it would help get the gimmick over.