That's not really true, on either side. Until the last century, most clothing you wore was dictated by formal rules relating to your job/social postion. Such clothing has changed very little, and tends to cycle. What HAS changed more often is the clothes we wear casually, though even then men has worn trousers consistantly for 150 years.
On the other side, classical and medieval fashion changed fairly often, beards, for example, were barbarian until Hadrian, Julius Caesar was (in)famous for his elaborate long-sleeved tunics, etc.
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