Hi Amanda!
Thank you for bringing your question to the Disney Parks Moms Panel.
If you are looking for the traditional
Mickey Ear Hat (like my friends Anabel and Linda are wearing at the end of the video in the top right hand corner) there are several options of where to find those! With these, you'll be able to put your boyfriends name on the back and he can choose from a variety of styles and characters! For this time of year, my personal choice would be the
Jack Skellington Ear Hat. For the largest variety, I'd recommend looking at the
World of Disney in the Downtown Disney District,
Elias & Co. inside of Disney California Adventure Park or
The Mad Hatter on Main Street, U.S.A. inside of Disneyland Park.
If you are looking for a baseball style hat, there is nowhere that I'm aware of in Disneyland Resort to customize these at this time. If you'd like to attach a pair of ears to a hat he already owns I've seen several DIY tutorials online from searching
Mickey Ear baseball hat DIY. I've also seen some plain baseball hats with Mickey ears on Amazon too!
I hope this helps you find exactly what you are looking for! Please let me know if you have any other questions.
-Lindsey ºOº