The details I remember, the one he wanted to challenge was the Red Knight (I think) and the other detail of the story that I remember was whoever was going to c

The details I remember, the one he wanted to challenge was the Red Knight (I think) and the other detail of the story that I remember was whoever was going to challenge him initially didn't have any armor and kept collecting pieces from other knights that he defeated along the way. I think it might have been Gawain now that you mention it. Pretty sure it started with a G so I kept thinking Gallahad. EDIT: Found it! Sir Gareth! https://en.wikipedia.org/wiki/Gareth#Le_Morte_d'Arthur https://en.wikipedia.org/wiki/Gareth#Le_Morte_d'Arthur