I found a Vault 77 jumpsuit somewheres. Is there a Vault 77 and if so where is it?

Well. There IS a Vault 77 but we don't know where it is, it hasn't really been revealed. The jumpsuit you found is sort of a joke/unique item because the head writer from FO3 commissioned the artist from Penny Arcade to draw a set of canon comics for the Fallout universe. http://fallout.wikia.com/wiki/Vault_77