Sleeves are important protection but they don't protect as much as a lot of guys think. They get tested by hanging them over a vat of fluid with an electrode stick down the inside of the sleeve. The rod only goes down the sleeve about as far as the cuff of the glove is maybe 4 inches from the end of the sleeve or a little more. Then the sleeve is dipped into the vat of fluid not going over the lowest point of the sleeve near the armpit. So from about an inch below the armpit to the button holes at the shoulder they are not electrically tested maybe the top 10 inches of the sleeve is just visually checked, then from the cuff end up to maybe 4-5 inches is not tested either. So the middle 20 inches or so is the only area tested. We had a few different rules for sleeves way back when you got within reach of energized conductors you wore sleeves, then there was a period of ground to ground, and then before I retired it was back to within reach. I never had a button come loose, the straps we had were two different styles one was all one piece with a head hole and four tabs coming off, the other style was separate straps front and back. I had both and liked the separate ones better but never a problem like you are having. That would be frustrating. T