Singer Bob Dylan sang lyrics about  growing his hair to his feet in his song:
"I Shall Be Free"
"I'm gonna grow my hair down to my feet so strange
So I look like a walking mountain range
And I'm gonna ride into Omaha on a horse
Out to the country club and the golf course

Carry the New York Times, shoot a few holes, blow their minds."
The song was recorded on 6 December 1962 at Studio A, Columbia Recording Studios, New York, produced by John Hammond. 
The song was released as the closing track on The Freewheeling' Bob Dylan on May 27, 1963, and has been viewed as a comedic counterpoint to the album's more serious material. Dylan has never performed the song in concert

Some people in the long hair community used Dylan's quote about "growing my hair down to my feet" as a signature and as an encouragement to continue growing their hair

It has become a popular long hair reference.   Bob Dylan is a singer, songwriter, musician, author, poet, and artist who has been famous for more than five decades