Hoodie string toggle
I got so frustrated when my hoodie strings pulled out for the umpteenth time. It seems they do it no matter how many knots I tie in them.
So I created these ends. After some searching I found they are called toggles.
Pull your string though, tie a knot. It's that simple.
My hoodie has the wide flat string but I think these will work for most as it has a 6mm hole.