It’s a good reason for lizards, anyway:
Young male lizards in South Africa imitate females to fool aggressive older males into leaving them alone, in an example of transvestism in the natural world, according to South African and Australian reaseachers. They found that young male Augrabies flat lizards (pictured) delayed
displaying the extravagent coloration of sexually-mature males until they were able to defend themselves adequately.
Of course in the natural world that means dressing down, as the males wear the bright colors and the females are something like dun.
Then again, Charlotte von Mahlsdorf seemed happy enough in her plain black house dresses.