Here are the original designs for the Ultrakids costumes in late 2006. Some of them are pretty radical; I mean, the actors thought the actual costumes were bad enough.
None of the actors were cast when I was sketching these, FYI.

This design is pretty close to the actual costume that my mom made. The red sleeve enders (I don't know what to call it) were taken out as well as the red belt. And who wants to wear yellow pants? Love the logo though, it's so cool.
Theses Ultra-suits are not like the Bat-Suit or whatever. They have no super-powers or gadgets or anything. They're just ordinary t-shirts that Over-the-Hill-Good-Guy made for the Ultrakids, canonically. That's something I love about the Ultrakids take on the Superhero genre: the very un-superheroness of it all. The Ultrakids don't even have real powers. They're like superhero wannabes.  But still, they can fight evil and all that good stuff. There's almost an analogy there that you don't need super powers to save the world.
Oh man, that's deep.
Okay, taken up enough word space.

This is actually kinda cool. I was such a flat drawer back then...

For the Sonic-Suit I was thinking kind of like a tye-dye type of shirt. I just couldn't think of a logo...or was too lazy to think of one.

My sister says this looks like Flintstones. I agree. I don't know what the little black shirt in the corner is doing there. Interesting to note that the pants part of the costumes were never made.

I don't know what I was thinking with this one. I must've slipped color-blind for a couple seconds while sketching.

Same tye-dye style as the Sonic-Suit. I don't know what the black scribbles on the sleeves are. Maybe it was a mistake.

Alright, that's all for now. See you guys around! Still writing that book. It's killing me. I have to make some changes to the beginning of the story, and that requires me to change everything in the middle that is does not...uh, what's the word...match up with what I changed in the beginning. Lots of work. I don't like work. So it's killing me.