One of the earliest memories I have of hair being so prominent in a TV episode is Family Ties.
Silky blonde Meridith Baxter Birney wears her locks in a glorious soft bun, and has it down & flowing.
Combrade, MOrab has located the episode and posted it here
In the MANE forum , in his reply to ' Justine Bateman '
Sitting thru the episode may be painful now 
, so scan to 3:03
5:26 and mmmmmmmmmmmm 16:35
You won't be dissappointed 