One of my favorites is the red breechclout shown in the first few screenshots of Greyeagle. Something about the color of it really jumps out at me, and if I could find an authentic one, I'd snatch one just like it in a heartbeat. Same with the leggings shown in that movie.
I'm also drawn to the fur breechclout worn in A Man Called Horse, but I chalk that up to being drawn towards animal totemism. The belief that performing a dance or ritual while wearing something representative of an animal (usually a mask or headdress) can impart traits onto the performer. I think I shared a photo in a previous post of me at a reenactment wearing my coyote pelt that illustrates the idea, but it's common in more than just Native American cultures. Vikings for example, or even Bronze Age civilizations. Which is probably why I also find caveman-style fur tunics/loincloths quite attractive. Like the furs Ringo Starr wore in Caveman