Wear a white dress shirt to impress the adults and a silly bowtie for the kids.
This is excellent advice... This is the same concept I use in my kid's show.
I wear the exact same thing for my corporate shows as I do for my kid shows... shirt and tie. The only difference is that in my kid's show, I wear a brightly colored polyester vest with big bright buttons. The pattern on the vest kind of looks like Fred Flintstones outfit.
Often, when I'm doing walk-around and table hopping for adults, I'll wear that same vest. It accomplishes two things:
1. People immediately recognize that I'm not just some guy walking around doing tricks, but that I was probably paid to be here.
2. The other thing is that it's an ice breaker. I usually walk up to a table and say, "how are you doing, or how's everything." They say "Fine." I then say, you're probably looking at my vest saying, "hey, I'd hate to be that guy." pause for effect... then continue with something like, "I'm the entertaiment here, so would you like to see a couple of tricks..." or some other opening line.