This one-boob top has a plunging off-the-shoulder line which has echoes of togas past while being a fashion that's modern and 'now' . Nipple jewelry is model's own.
Rules (fashion styles) of AltBoobWorld. See comments for brief list, but basically please don't be posing in underwear or lingerie, please don't be fully topless (must be clothing + boobs) and please don't clumsily roll up your top or pull it aside.