ImFormal

Impressionist Formal, or Imformal, is a dress code used especially for underground or so-called "guerrilla" events, such as the guerrilla balls series. It requires attire and accessories that project the impression of formality--or extra formality--to the public eye, or incorporates exuberance derived from traditional formal dress. This includes standard White Tie (colloquially: "top-and-tails/ballgown",) Black Tie ("tux/evening gown",) and some extravagant versions of Formal ("suit-and-tie/evening dress".) It may also include variations such as non-western traditional, military, and period garb, caricature, couture, etc. as long as it appears to the observer to have aesthetic integrity (i.e. it looks good.)

It is context dependent, such that the adopter (or group) should be distinguishable from the norm or default the by their degree of projected formality, extravagance, or exoticism