Why do tomboys feel weird in dresses and skirts?

my cousin, a tomboy in her own right, was wearing a dress for like the first time ever what seemed like. she went to a wedding with her fiance and she said she changed out if it right as the wedding ended. she said she felt weird in it

Why?
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im looking for technical reasons, not obvious ones
Why do tomboys feel weird in dresses and skirts?
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