Exodus 28:37-42

37 Tie it to the front of the turban with a blue cord.
38 Aaron is to wear it on his forehead, so that I, the Lord, will accept all the offerings that the Israelites dedicate to me, even if the people commit some error in offering them.
39 "Weave Aaron's shirt of fine linen and make a turban of fine linen and also a sash decorated with embroidery.
40 "Make shirts, sashes, and caps for Aaron's sons, to provide them with dignity and beauty.
41 Put these clothes on your brother Aaron and his sons. Then ordain them and dedicate them by anointing them with olive oil, so that they may serve me as priests.
42 Make linen shorts for them, reaching from the waist to the thighs, so that they will not expose themselves.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.