Apple press release from Macworld 2003:
Burton Snowboards and Apple® today unveiled the limited-edition Burton Amp, the world’s first and only wearable electronic jacket with an integrated iPod™ control system.
Much like today’s wearables, it was a huge success. They sold literally dozens of them.
While dedicated jackets didn’t catch on, it was pretty common to wear an iPod while skiing or snowboarding during the heyday of the iPod. Now, I hardly ever see anyone wearing headphones. Presumably safety won out, which is a good thing.