I have occasionally noticed that late Medieval representations of our most blessed Lady often show her bare-headed and with her hair over her shoulders and arms. I think of the Marian banner in St John's College (reproduced in Duffy Fires); of the statue of the Assumption in the church at Sandford upon Thames.
And the Roman Pontifical, describing a Queen approaching her Coronation, says that she comes crine soluto. The records of the Coronations of Good Queen Mary and of Bloody Bess agree: she wears her hair loose and 'decently let down on her shoulders'.
One of the 'Horatian' poets of Urban VIII's renascimento wrote:
Tu [his friend Rosa] rerum dominam canes,
Et sparsam Zephyrorum arbitrio comam
Nudis ludere bracchiis,
Et nimbos volucrum fundere crinium ...
Medieval precedent, I think, going hand in hand with baroque movimento.