Musar zu Wajikra 13:2

I have previously referred to an allusion contained in the words: אדם כי יהיה בעור בשרו וכו'. The vestments for the priests were to be לכבוד ולתפארת, "for dignity and adornment." These were to symbolize the כתנות אור, garments of light, which Adam and Eve wore before they had to exchange them for כתנות עור garments of skin, after the sin. Onkelos translates כתנות עור as לבושין דיקר, "precious garments" (Genesis 3,21). At first glance it seems that Onkelos equates כתנות אור with כתנות עור and בגדי כהונה. There is a mystical dimension to this comparison which is rooted in Kohelet 2,13: כיתרון אור מן החושך, "as the advantage of light over darkness." The message there is that G–d makes purity emerge even out of impurity. I have dealt with this at length in one of my addresses on שבת הגדול, the Sabbath preceding the festival of Passover. You will find it in my tractate Pesachim.