Knife And Leather Drawings, Mark Evans

In religiously diverse countries, leather vendors are typically careful to clarify the kinds of leather used in their products. For example, leather shoes will bear a label identifying the animal from which the leather was taken. In this way, a Muslim would not accidentally purchase pigskin leather, and a Hindu could avoid cow leather. Many Hindus who are vegetarians will not use any kind of leather.
Such taboos increase the demand for religiously neutral leathers like ostrich and deer.
Judaism forbids the comfort of wearing shoes made with leather on Yom Kippur, Tisha B'Av, and during mourning.
Jainism prohibits the use of leather since it is obtained by killing animals.