Re leather shoes. Here is a quote from a company producing vegan shoes:
leather used for fashion unfortunately is not very natural at all (and far from always a by-product from the food industry). Toxic chemicals such as zinc, lead, dyes, cyanide and formaldehyde are used to treat it, which makes it decompose very slowly, producing a greater quantity of refuse which has an obvious negative environmental impact. In addition, tanneries consume a lot of energy and are very polluting; and the carcinogenic chemicals used negatively affect the health of workers, too.
This company uses a variety of materials to produce vegan shoes including micro fibre PU (which holds the EU eco label), plant based polymers (as opposed to those produced from petrochemicals), a fabric made from pineapple leaves, cork and recycled rubber. Companies such as this are continually looking to reduce their carbon footprint and to remain ethical. I think these materials compare very favourably in every respect with the more traditional leather goods we have been told are ‘natural’.