Suit his book - Idioms by The Free Dictionary
suit (one's) book (redirected from suit his book)
suit (one's) book
To be ideal, convenient, or acceptable to one. It suits our book to have all the meetings in the one day, but organize things however they are most convenient for you.
suit someone's book be convenient or acceptable to someone. British
ˌsuit your/somebody’s ˈbook (British English, informal) be convenient or useful for you/somebody: Well, if you’re honest and hard-working, that suits our book.