Formal/informal

[variable]

Due to the lack of a Q&A thread I will post my question here

Ive come across the phrase "informal" alot on the legion bords.

Whats does this mean when it comes to conventions or other events? I know that the NG have certain standards and a costume is ok to use at certain events but not at others, would this be the same thing or does it mean something eles?

[Anakin Skywalker]

informal is not usable at a high profile event, that's the only thing otherwise you're good to go, but you have to have a formal costume to be in the RL