Visual bug - white line going down back and butt

Matthros

Has anyone noticed a visual bug when running or riding a mount with a white line appearing down the middle of the back and butt?

This image is from my female dark elf using the Naryu costume and I have seen it when using the Graht-Climber's outfit as well.

Cloudtrader

It's a bug with the Naryu costume, I believe, as I only notice it on the character that is wearing it.

static_recharge

I get this issue when wearing the outlaw medium chest in my outfits.