You'll want to order a headband for each one.
Seuss fun to any outfit! But he was pretty fun in real life too! The Thing 1 and Thing 2 medallions in the middle of the bow are interchangeable and secure with a hook and loop fastener, so your kid can easily choose which Thing they are. He was introduced as Dr. Blue Thing 1 & 2 Fuzzy Headband Costume You can see it in his rhyme schemes and his wild illustrations.