BOR: Correct me if I am wrong. I am under the impression that when you wear tzitzit outside of the home it shows the world who you are, but when you wear them at home it is for the sake of your own neshama.
Also, it has always been my experience that garments that are 100% cotton are far cooler than those blended with polyester or polyester on its own. Cotton is supposedly cooler and certainly absorbs perspiration much better than poly or a poly blend.