Adam Clarke on Genesis 27:27

The smell of my son is as the smell of a field - The smell of these garments, the goodly raiment which had been laid up in the house, was probably occasioned by some aromatic herbs, which we may naturally suppose were laid up with the clothes; a custom which prevails in many countries to the present day. Thyme, lavender, etc., are often deposited in wardrobes, to communicate an agreeable scent, and under the supposition that the moths are thereby prevented from fretting the garments. I have often seen the leaves of aromatic plants, and sometimes whole sprigs, put in eastern MSS., to communicate a pleasant smell, and to prevent the worms from destroying them. Persons going from Europe to the East Indies put pieces of Russia leather among their clothes for the same purpose. Such a smell would lead Isaac's recollection to the fields where aromatic plants grew in abundance, and where he had often been regaled by the scent.