Stick with the hook and loop closures (since they make wiggly toddler diaper changes much easier) and always put pants, shorts, or a onesie over the diaper.
We did not use it as a diaper cover, but over a PUL cover, usually with a onesie only snapped in the middle or just pulled far down, and my shockingly - heavy - wetting little baby needed that extra protection at night!