A detail from an engraving reproducing the painting of the Battle of Assietta
link during the War of Austrian Succession by Hyacinthe de la Pegna
link . A zoomable version of the whole painting is available here
link ; full of 'authentic' looking details such as the ersatz gaiters of canvas.
Unfortunately it seems that the only images in full color available on the web are incomplete, showing only the upper right part with the death of the French commander the Chevalier de Belle-Isle
link
As far as I know no manufacturer offers such gloriously decorated military mules (which according to a contemporary text
link were 'punished' by being deprived of their bells and plumes if disobedient!). Of course they would look more 'warlike' without their eating bags!
Thanks to 'Ralphus'who posted the link to the engraving on the 'Wars of Louis XIV' blog link . I already knew this B&W image from "L'histoire universelle des armées', Laffont, 1966,