(1) Groups of people migrate away from the equator:
To stay warm, they start to wear animal skins.
(2) Animal skins are eventually replaced by cloth:
Cotton and other plants are cultivated; weaving is invented.
(3) Clothing becomes more common in public:
People go clothed everywhere; nakedness suggests indecency.
(4) Covering one’s body becomes the norm:
People in public expect to be see others wearing clothing.
(5) Removing your clothing in public is outlawed:
Not wearing clothing is considered a gross invasion of privacy.