More advantages of gothic prom gowns to note:

It is also a statement of individuality - it doesn’t mean you listen to Marilyn Manson, remember you are not wearing goth - but it shows you are prepared to stand out and be looked at, a very appealing quality.

This individual statement can also be one of the disadvantages of wearing gothic prom gowns - people will notice you alright, but not everyone will like it.
Maybe some people who have lower self esteem will react by directing some abuse your way.
It’s never likely to be anything of any note, but you should be aware of the possibility.

It may also be uncomfortable!
If you aren’t used to the tight fitted type of clothes, it could feel like a very long evening after quite a short while, so it’s a good idea to spend some time in the dress to get used to it.

As ever, the choice is down to the individual.
In this day and age, you dont have to be brave or extreme to wear goth, but you do need to be aware of the disadvantages to go along with the advantages!