Why not 2 belt holsters? One with a gun, one with a flask of whatever hard liquor is most appropriate.
Twin drop leg holsters starts looking a little too Lara Croft, I think. Maybe hip holster for a flask, drop leg holster for pistol? Or maybe flask in the drop leg holster, pistol in the hip holster...
Or maybe just a bandolier with mini bottles of Capt. Morgan... No, as awesome as that would be, it doesn't fit with the character.
Also, I wonder if she should have a pair of flying goggles around her neck or on her head... Kinda like Shive's avatar, or Gaige or Patricia Tannis from Borderlands 2...
Also also, I wonder what she would look like with shorter jacket sleeves - she may be better as it stands, as her hands do look rather 'brawler', but I'd still be curious how it would come off.