Batman Family #10 (1977)

When Batgirl is invited to Provincetown, she tries to get Robin to go with her, but Dick finds himself busy at Hudson University with personal affairs. However, Dick tells Barbara to meet with an old friend of Bruce, whose name is Kathy Kane. On the road to Provincetown, Barbara reads some mail to Batgirl, which suggests that she should change her name to Batwoman, but she doesn't give it much thought, as she knows there was a Batwoman once in the past, but has retired. Upon arriving at Provincetown, Barbara witnesses the Cavalier's crimes and she confronts the criminal as Batgirl, allowing the police to arrest the colorful villain. Later, Barbara meets with Kathy Kane, but before they could get to know each other, they witness how a giant moth is attacking the Police Department. Sneaking out of sight, Barbara changes into Batgirl and confronts the one responsible for the giant moth attack: Killer Moth. Batgirl finds it difficult to fight Killer Moth with his new weapon, but things only get harder when the Cavalier is sprung out of prison and joins Killer Moth in his efforts against Batgirl. At that moment, Batgirl gets help from Batwoman, who frees Batgirl and allows them to fight against the crooks. Despite their combined work, the villains escape thanks to well placed illusions that trick the heroines and stump them. Back in their civilian identities, Barbara and Kathy go on a cruise, where they are once again suddenly attacked by giant moths. Both ladies get the same idea of making up an excuse so they can change into their secret identities, but while they switch, they learn about each other's secret. Without a dull moment, the ladies go into action and while Batwoman confronts and captures Killer Moth with his own weapon, Batgirl fights the Cavalier and also puts an end to his crime spree. Afterwards, Barbara and Kathy go to an amusement park to discuss their secret adventures. It is then that Barbara reveals to Kathy that people had suggested she should claim the name Batwoman, and Kathy agrees, as she only came out of retirement for this special occasion and has no intention of going back to crime fighting. Barbara however, refuses to take the name and chooses to stay as Batgirl, since she considers that there is only one Batwoman.