What do I wear to this?

[chewbaccathehooky]

Going to a massive dance event Saturday night. Think over-40s clubbers, but in mega venue with full orchestra. V stylish crowd and I’m just LOST! Jeans and trainers maybe, but what on top! Please help!!

[Loopytiles]

Surely anything goes? Presume will be hot inside and cold out and dancing? So a little top and warm coat, but that’ll mean a queue for the cloakroom!