Why historical clothing has so many layers?

In this video I go through the basic layers of historical dress up until the 1920s with the focus being on the function of each garment rather than how it evolves through time. I also briefly talk about hygiene practices and understanding in the past and how that effected how we dress and touch on laundering practices and how they too effected the garments and layers worn. For a more in depth look into the function and history of the corset: https://youtu.be/aF20riATkh0?si=l4f8sQ_h1wZm8JJ5 and for how victorian women dealt with periods: https://youtu.be/wVz8RZZFF-g?si=R8IylN0jVsDMn1A0 For more reading: https://colonialquills.blogspot.com/2019/08/18th-century-hygiene-part-2-bathing.html https://www.bloomsbury.com/uk/shaping-femininity-9781350164123/