Take a look at this absolutely brilliant Tardis dress:
It was made in 2018 by May Yet for a friend to wear at the Tokyo Comic Con. Sadly, the original post where I found it is now gone, but Yet wrote a new post where they give a bit more info and show new photos.
The dress is so gorgeous you could also wear it for semi-formal, non-geeky events. The absolutely best feature is that IT’S BIGGER ON THE INSIDE! Aaaaah! 😀
Note: I wasn’t paid or perked to mention this; just passing along a good thing.