It looks to me like the buttons are just sewn on for decoration. I would just get a couple big buttons in the main color of the sweater and sew them on.
-a black and white scarf for my sister
-a swimsuit coverup for my stepmoms bday
In the future (I hope):
-a Deathly Hallows wristband
-a Weasley sweater
-a Gryffindor scarf
drummerboi202 on Ravelry