Why is crossdressing so taboo?

Many people crossdress, some do it extremely well.

Some men just look better in women's clothing, or ambiguous clothing, or unisex clothing. As another counterpoint, many women can wear mens' clothing without having ANY negative ramifications or even the smallest of folkways.

Why the one-way-street? Why is crossdressing taboo in the first place? I don't get it why is it.
Why is crossdressing so taboo?
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