Śatapatha Brāhmaṇa ("of a hundred paths") 3.1.2.16

3.1.2.16

avacito hi vai puruṣaḥ | tasmādasya yatraiva kva ca kuśo vā yadvā vikṛntati tata eva lohitamutpatati tasminnetāṃ tvacamadadhurvāsa eva tasmānnānyaḥ puruṣādvāso bibhartyetāṃ hyasmiṃstvacamadadhustasmādu suvāsā eva bubhūṣetsvayā tvacā samṛdhyā iti tasmādapyaślīlaṃ suvāsasaṃ didṛkṣante svayā hi tvacā samṛddho bhavati

For man was indeed flayed; and hence where-ever a stalk of grass or some other object cuts him, the blood trickles out. They then put that skin, the garment, on him; and for this reason none but man wears a garment, it having been put on him as his skin. Hence also one should take care to be properly clad, so that he may be completely endued with his own skin. Hence also people like to see even an ugly person properly clad, since he is endued with his own skin.