A lot of motorcycle jackets have belt loops, and a lot of those belt loops have snaps. I have yet to see a pair of pants that has belt loops that aren't solid. I can't for the life of me see what the purpose of the snaps is on a jacket's belt loops. They tend to twist when fastened, resulting in belt loops that aren't straight, and end up ruining the lines of the jacket. But they seem to be quite common, particularly on classic and high end motorcycle jackets. I much prefer solid belt...
Jacket belt loops with snap closures
Jacket belt loops with snap closures