After you get in the shower, force the wire loop on the binder clip around the nub on the suction cup to secure the curtain. Try magnets. My favorite quick fix is to buy some strong magnets from ...

The Gorilla Grip Bathtub Shower Mat offered the best slip resistance we found in a shower mat. Its 300-plus suction cups keep it securely attached to a shower floor, while its textured top remains ...