This is a simple one. I have this nice little snow hat that we bought for our first baby. Each one of our kids wore it as a toddler and as all toddlers will do, each one has ripped it off their head despite the chin strap.
KAM Snaps to the rescue!!! I was able to customize the chin strap and make it comfortably smaller, I have big headed kids but none as big as that hat was planned for :), and I replaced the Velcro (do you see a theme here :P) with one snap set.
And Tada!!! And as a bonus, it stays on her head until she is ready to come inside.
We sell convenient 10 packs of every one of our 130+ colors for just such a project here: