Did you know that on a blouse or jacket very seldom do you have to use the pattern placements for buttonholes down the front?
The first buttonhole is positioned one inch above the bust line. The second is positioned 1/2 inch from the top. If there is enough space the third buttonhole is positioned 1/2 way between the first and the second.
The remainder of the buttonholes are then positioned the same distance apart. If there isn't enough space between the first and second buttonholes then the space between these is the distance between the remainder of the buttonholes.