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.
From the sadly now-defunct "Outdoor Co-ed Topless Pulp Fiction Appreciation Society". As well as being a fun pic, this dress just looks natural, doesn't it? Perfectly styled!