And ten on each trouser cuff, and five more behind the placket.
There were ten buttons at the cuffs of his frock coat. From his neck to waist ran a row of buttons forty-five in number.
Every morning, Severus Snape methodically, deftly, fastened the black wool that protected him from emotional slings and arrows as surely as chain mail from a rapier.
One-hundred times in the morning, one-hundred more when he retired for the night - as each button was pressed through its hole, he silently repeated the phrase, "Forgive me."