"Chamois" is a goat like animal and the term is used to describe it's hide. So a "chamois" is a specific variety of leather. In the USA, it generally refers to sheepskin or lambskin tanned only with oils.
Since there aren't any (or very few) shorts/bibs/etc. made these days with this variety of leather, the correct term is "pad."
Thank you for listening.
The rest of the answers to the OP question are already posted.
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Some sort of pithy irrelevant one-liner should go here.