Does Anyone Know Why These Humans are Dressed Like This?

In this latest Hearthstone video...

[https://youtu.be/qLW3x1alLtg?t=49](https://youtu.be/qLW3x1alLtg?t=49)

...I just have no idea where these outfits came from. If it weren't for the two main characters I wouldn't think this was set in Azeroth.

I thought maybe it had something to do with the Lost City of Un'goro but I did some research and that looks like it's all tortollans, not humans.

They aren't dressed like anyone from the Eastern Kingdoms. They don't look like villagers from Beledar. They don't look like Wastewander bandits or pirates. It really bugs me. I know Hearthstone is not strictly beholden to lore but I wouldn't expect them to make something like this up without at least a related card set featuring the dress fashion.