While costumes are not required at Fallout New Vegas Celebration, it’s always fun to dress up in something appropriate. Generic wastelander costumes are totally fine, but here are some direct Fallout ideas:

New Vegas Characters

Vault Dweller

Probably the most recognized costume from the Fallout universe is the vault suit.
The vault suit always pairs with the forearm computer called the Pip Boy.
Due to the suit’s somewhat complex details, it’s usually best to buy a vault suit from cosplay clothing manufacturer.
The word on the street is that miccostumes makes a good, budget vault 111 suit.
Other decent suits are made by procosplay and manles.
If you want to make your own vault suit from scratch, you will want to consider these two patterns:
McCalls 4830 (men’s jumpsuit)
Simplicity US8615BB
It’s also not uncommon to see improvised vault suits made out of blue mechanics coveralls. All you really need to do is sew some yellow fabric to the front and neck.

NCR Trooper

As the official host of the festivities, you’ll see lots of New California Republic troopers all around Goodsprings.
NCR solders typically wear a khaki uniform, with leather armor, and a variety of headgear.
The headgear ranges from a red beret, a pith or sun helmet, and even a campaign hat.