I'm not sure painting clothing with house paint really works...
Looking at this thread, I've come to the conclusion that trying to dye what are relatively cheap clothes really isn't worth the hassle. You've got to buy the dye, etc, and then go through all the work of dyeing the jacket, etc. If its camo, its right pain, and if its doesn't work, it just looks a bit strange. You can buy a surplus M65 type jacket (Austrian or Dutch) from £15 upwards - not camo, and no need to dye it.