On ears, they are now really pushing it with each month new ears, but to be honest, I don't see THAT many more ears out than before.
Last month it was Arendelle Blue, this month it's Belle Bronze. They are creating a hype.
The wearable merchandise for adults is less loud than in the US or Asian parks, it's more subtle, in my opinion.
DLP is not Asia, where it's about see and being seen and really dressing up as characters and make pictures of yourself around the park, nor US where it's more a general love for Disney that is displayed. It's more relaxed, and just wear whatever you are comfortable in, which occassionally has a Disney logo or figure on it.
No one will look at you funny, wear what you want to wear.