Superman The Animated Series -- the Dini/Timm cartoon. One of its better points, albeit one possibly inspired by potential toy sales, was having STAR Labs create a protective anti-Kryptonite (and anti-Parasite) suit, which naturally was made of lead or an alloy, and featured a lead-glass faceplate. They also made him a spacesuit as part of turning his spacecraft into a single-seat personal starship.
Alternatively, you could have been inspired by Wendy's classic For The Greater Good -- or simply come up with the idea independently. The description of Clark's impromptu tailoring just seemed similar to the STAS suit, but again, YMMV.
