When your sewing with velcro, it’s best NOT use the kind that has the sticky backing on it.
It gums up your sewing needle and then pulls the thread and causes missing stitches. NO FUN!!!!!
I usually buy it by the yard instead of the little squares or circles or small strips.
Also it’s cheaper to buy the wider velcro. So get the 1 1/2″ or 2″ width and just cut in half. You get more for your money this way!!!!