It is 'customary' to hold the door open for someone who is entering a building behind you.
He did the work with his 'customary' efficiency.
She dressed in her 'customary' fashion.
(..) Mmm-hmm. If you change your mind... What'd you do that for? You know he's on aid. On major holidays, Willis, it's customary for the lord of the manor to offer drippings to the poor. You're so full of shit! (DOORBELL RINGS) Hi. Mrs. Rossi? Yes? (..)1992 Scent of a Woman