Hello Jazmen,
I hope you are having a Fiddler, Fifer, and Practical day. I'm so excited for you and your friend to go to The Happiest Place on Earth!
I absolutely love walking through the Disneyland Resort and seeing all the creative Disney inspired shirts and outfits in the parks. Personally, I love to
DisneyBound; where you use inspiration in your outfit by pulling out the color pallets and use accessories from a Disney character to subtly look like them.
You are fine to wear homemade Disney inspired shirts to the parks as long as they are not offensive and that it is not inappropriate for a family environment.
Be sure to take your friend on the newly refurbished attractions. Some not to miss attractions are Big Thunder Mountain Railroad, Finding Nemo Submarine Voyage, Sleeping Beauty Castle Walkthrough, all of Disney California Adventure (specifically: The Little Mermaid - Ariel's Undersea Adventure, Radiator Springs Racers, all of Carsland, Goofy's Sky School, and California Screamin'), to name a few.
I hope this helps and that you have a pixie-dusted time on your next visit. If you have any more questions, please visit us here and let us know how we can help you plan your magical vacation.
Wishing you magic!
~ Lynette