Do you want to know about the growth of the cotton plant, the harvesting and manufacturing of cloth or the design and manufacture of the jumper itself?
Since these not my area of expertise, I searched Google under the key words "Cotton growth" to get these possible sources:
Under "cotton cloth", I found:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. If not, please repost with more specific questions. Thanks for asking.