Before we get to the rise of the Tiffany Network, CBS - let's take a moment to celebrate the arrival of color television in the USA, which began in earnest in the 1960s. Although it would be nearly a decade before color televisions would be in the majority of American homes, the concept of color television literally changed television -- especially when it came to costumes, outfits, and set design. No more scenery and makeup designed for a black and white world.
NBC was the most aggressive network at adopting color for its network shows. CBS was in second, committing to launch many of its new shows for the 1965 television season in color. Shows like Hogan's Heroes had pilots shot in B&W, but premiered in living color for the tiny group of people who had color sets way back then.
Unfortunately, film stock from this period has a tendency to be unstable, which is why so many color shows from the period seem oddly darker, washed out, or pastel. In many cases, the color has lost... well, some color over the years.