Drag Bandits by Colleen Frakes & Betsey Swardlick
Louisa puts up with her husband Stephen's hobby of taking her second-best riding habit and disguising himself as a woman to rob coaches. Their neighbor, Sir Ogilvie, has always been after their estate, and when Sir Ogilvie is robbed by Stephen, he believes that Louisa is the infamous masked lady bandit and puts into motion a plan to kidnap her.
Horses! Banditry! Men dressed as women!