Hi Chloe! Thanks for stopping by the planDisney website and for your question today!
I am such a big fan of Minnie headband ears! I love the different patterns, and textures, and how they take your park outfit up a notch! I sometimes bring multiple ears to the parks during my visits and change them throughout the day. I spoke to a Cast Member, and at this time, you can only embroider hat-style ears that were purchased that day.
The Mad Hatter in Fantasyland at Disneyland Park, and
The Mad Hatter on Main Street, U.S.A. offer this option, and over at Disney's California Adventure Park,
Kingswell Camera Shop and
Elias & Co. are great options.
Chloe, have the most magical visit to Disneyland! Enjoy all the churros and Mickey Premium Ice Cream bars for me!
Frances