There Is No Dancer (yet)

[Berethos]

You're right, a flowy gown wouldn't make a Dancer.

But, and this is important, those who think of her as a Dancer aren't looking at her flowing garments, outside of the specific use of a weighted ribbon/cloth-type thing as a weapon, when thinking she might be a Dancer.

They are looking at how she actually moves, which has noticeable differences throughout the teaser.

It's not even speculative. The lady in the trailer used monk moves.

Not really. Every mention of a Monk move I've heard or seen so far doesn't actually match with the animation of said move, and kicks are hardly Monk exclusive.