they look more androgynous with their heads shaved. hair is one of those highly cherished marks of a woman's beauty, so it makes sense that it would be important in passing. if i had my head shaved, i would look like a baby pretty much. there's women with short hair that look really good with it. emma watson is an example. she doesn't have her head shaved, but it's very short. it depends on who you are, but usually a woman with a shaved head is labeled as a lesbian when she could've had it shaved for many different reasons out of her control.
anyway, i think looking like a woman was the least of the concerns of the women who went through this since they were publically humiliated and beaten to death afterward.