The upturned collar hid the features above it; so did the projecting brim of a slouch hat.
A collar of opalescent beadwork hid the secret sign at her throat.
The high collar of my cloak hid the wound in my throat as I passed the guards.
Her cloak and collar hid the gash his brother's blade had made, but her face was even worse than he remembered.
The high collar of a black cloak hid the face below the sharp nose.
(His collar hid one of the little marks at least, and the other was not particularly noticeable.)
From it he drew a black cloak which he donned and raised so that the collar completely hid his face.
The upturned collar of a black cloak hid the invader's features.
The tall collar completely hid the metal band around her throat.
The upturned collar of the cloak hid the face of the personage who wore it.