Genesis 24:65

However, in regard to those who are betrothed, I can declare and avow this with more than my usual firmness: their heads should be covered from the day when they first trembled at the kiss and handclasp of their future husband. For in these symbols they have pledged every bit of themselves—their life throughout its full development, their flesh throughout their lifetime, their spirit through their understanding [of the contract], their modesty through the exchange of a kiss, their hope through their expectation and their mind through their willingness. For us, Rebekah stands as sufficient example; when her future husband had been pointed out to her, she covered her head with her veil merely because she knew she was to marry him.

Like Rebecca, who, upon learning that Isaac was coming towards her, descended from the camel and covered herself with a cloak (Genesis 24:65): so too this bridal soul anticipated the marriage insignia, lest she be rejected as not having the bridal garment; or lest she veil her head because of the angels.

(Verse 65.) And he took a theristrum, and covered himself. Theristrum is called a cloak, also a type of Arabian garment, with which the women of that province are veiled.