The story
* (television): An allusion to the idiocy of television programming and the supposed audience for such (boobs) and that the televisions of that era used cathode ray tube (CRT) vacuum tube displays. First use appears c. 1959, in the The Herald Journal. * (clothing): Due to the clothing being a tube-like garment that covers the breasts (boobs) of a woman. First use appears c. 1977, in the Daily Mail.
Etymology from Wiktionary, CC BY-SA 4.0.