I love the flexibility of being able to remove a pompom from my hats or change colors, so I sew a button on inside the hat. It's a perfect way to match your mood and/or remove a pompom to wash the hat! Shown here is a purchased pompom (aka head-tribble) with an elastic loop, but this also works for handmade pompoms with yarn tails. In that case, just bring both tails to the inside and tie them around the button.
If you love this type of content, please like and subscribe! And you can sign up for my newsletter here: designsbyromi.com/newsletter/