Ancient Roman men wore tunics. In fact, wearing pants or boots was against the law.
A law from 397 and then another in 399 CE strictly regulated the wearing of pants and boots in the city of Rome:
Within the city of Rome, no one shall wear pants or boots. But if any man after the issuance of this regulation of Our Clemency should obstinately persist in such contumacy, he shall be punished accordingly as his legal status permits and expelled from our sacred city (Codex Theodosianus, 14.10.3 [June 6, 399 CE])
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