The meaning of Coat in the Bible
(From Easton's Bible Dictionary)

the tunic worn like the shirt next the skin (Leviticus 16:4; Cant. 5:3; 2Sam 15:32; Exodus 28:4; 29:5). The "coats of skins" prepared by God for Adam and Eve were probably nothing more than aprons (Genesis 3:21). This tunic was sometimes woven entire without a seam (John 19:23); it was also sometimes of "many colours" (Genesis 37:3; RSV marg., "a long garment with sleeves"). The "fisher's coat" of John 21:7 was obviously an outer garment or cloak, as was also the "coat" made by Hannah for Samuel (I Samuel 2:19). (See DRESS .)

See more on the meaning of Coat in the Bible:
Coat {International Standard Bible Encyclopedia}

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