Why do people wear different clothes in different seasons?
Why do we need to wear different clothes when the weather changes?
Because when the climate changes, we have to think about either layering up or keeping cool. The colder the climate, the heavier fabrics/ textiles we need to wear (wools, fleece, thermals, etc.), and the warmer the climate, the lighter fabrics/textiles we need to wear (cotton, linen, chiffon, etc.)