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Habitual: adjective - of the nature of a habit; fixed by habit; constantly repeated or continued; customary, constant, usual, continual.
Unusual: adjective - not usual; different from or contrary to what is expected or usual; exceptional, uncommon, unconventional.
'Henry shuffled across the floor in pursuit of Adrienne, his habitual expression of hunger and need writ large on his eager face in a way guaranteed to ensure his failure as soon as she turned to face him.'
'Sheila, noted for her conformity and generally nondescript manner of dress, had taken the unusual step of attending the gathering dressed as a Bunny Girl, which was all the more noticeable since the rest of the guests had decided on more formal wear for the funeral.'