https://www.cnet.com/news/iron-fist-season-2-teaser-hints-at-comic-outfit/

The Netflix show's newest teaser, titled Memories, shows Rand thinking back to a time when he and another man appear to be training while wearing a yellow mask. And that mask is very similar to the character's Marvel comic book look, which is often paired up with a green outfit, as seen in the below photo.

Marvel's Luke Cage (left) teamed up with martial artist Iron Fist in the comics.