Jamieson, Fausset and Brown on Genesis 27:13-17

13-17. and his mother said unto him, Upon me be thy curse--His conscience being soothed by his mother, preparations were hastily made for carrying out the device; consisting, first, of a kid's flesh, which, made into a ragout, spiced with salt, onions, garlic, and lemon juice, might easily be passed off on a blind old man, with blunted senses, as game; second, of pieces of goat's skin bound on his hands and neck, its soft silken hair resembling that on the cheek of a young man; third, of the long white robe--the vestment of the first-born, which, transmitted from father to son and kept in a chest among fragrant herbs and perfumed flowers used much in the East to keep away moths--his mother provided for him.