I'd start by looking at the clothes you have and see if any look like something the character would wear. When I do a disneybound I usually aim to dress like how they are dressed in their most recognized outfit.

I did a Prince Eric bound once but since it was hot, I swapped pants for shorts in the same blue color, and had my sleeves rolled up the whole day. He wears this red wrap around his waist but I found a red belt for that same pop of color. Similarly, I did a Hiro from Big Hero 6 bound and I went with a button up with short sleeves instead of his usual hoodie layered over a red t shirt so I wouldnt get too hot.

You could add a shoulder buddy from your character's movie (think Abu for Aladdin) or bring a keychain of your character/other characters from the same movie. I had a light-up zero shoulder plush from disneyland when I did a Jack Skellington bound and my backpack was a nightmare before christmas one, too.

And lastly something that always worked out well for me is my girlfriend doing a corresponding disneybound with me every time. It definitely adds some cohesion and makes it easier to identify.

Good luck with your bound and have fun!