Taking Steps

On Saturday 10/25 Zack took 1 step. He would not try again on Sunday. He did not fall or anything but did not try again.
Zack is going to be a biker baby for Halloween and Christopher is going to be Batman. I bought some cowboy boots, that was the closest I could find to biker boots, we will cover most of it with his pants anyway.
Christopher's costume is full on as in covers his shoes and everything. My only concern for him is what he should wear under it, regular clothes or long johns.