How far apart should buttons be?
Spacing buttons about 2-1/2 inches apart helps to prevent gaping. Purchased clothes often have wider spacing, as a cost-cutting measure; don't scrimp on your sewn garment. When you sew horizontal buttonholes, be sure to place them the correct distance from the garment's opening edge.
Should buttons be on left or right?
Are the buttons on your shirt on the left side or on the right? There's actually a pretty easy answer: if you wear women's clothing, the buttons are on the left side of the shirt. However, if you wear men's shirts, the buttons line up on the right side.