There are a few tricks to help keep your hair clip from slipping. First of all, you can use the trial and error method to see just how much hair you need to grab so the clip won’t slip. That’s not a fail-safe method, so to be extra sure you can use a bit of hair spray or dry shampoo. Apply a bit of spray on the spot the clip will go, let it dry a bit, then fix the clip in place. If you have troubles with a barrette clip, simply use a bobby pin. Place the bobby pin right under the barrette so it will stay hidden.