Here's our plan (we don't have pics yet!):
MK: Red tee shirts I made (using Cricut) with black mickey heads and white Waltograph names
EP: Dr. Who shirts for DH & I, other Mickey shirts I found at Kohl's for boys
AK: Zoo tee shirts for the boys, Up tee shirts I found for DH & I at Hot Topic
DHS: Star Wars tees for all of us
SeaWorld: Blue tee shirts I made (using Cricut) with Seaworld Rescue Logo on them (my favorite of all)
Legoland:
Lego shirts for boys, Batman shirts for DH & I
So, I made a few, bought a few, and recycled some we already had (Star Wars, Lego, Zoo, etc.)
I also made navy blue sweatshirts with Nemo (we are staying in a Nemo room) and walt Disney World logos on them for the plane and any later/cooler nights.