Jim decided to test it on his neighbour, a man called Leonard Gondman (or, 'Leno' as he and his family often called him), a man with light brown skin, a small belly, a head of balding black hair, and wearing a purple sweater, black pants, and black shoes, who was watering his garden.
Jim saw him from outside his bedroom window. "He looks like a perfect subject to change size." Jim said to himself.
Then, Jim stopped.
One thing Jim thought about was his clothes. Jim remembered that when the old man used the balloon on him, his clothes were not affected. That could probably be solved by including his clothes when shrinking/growing himself and/or someone else.
Jim tested it out. First, He said, "control my clothing size. "
He put the balloon to his lips and blew into it twice.
Immediately, his clothes (apart from his shoes in socks) grew 2 sizes bigger.
Then, he shrunk them back to normal.
It was then Jim that when he used the balloon to control his clothing size, the balloon affected all the clothes he was wearing at the time.
And the same thing would happen to someone else's clothes too.
"Hmmm." Jim thought to himself. "Maybe I should try growing or shrinking one piece of my clothing, to see if I can make clothes change size separately."
He especially remembered that some people who got shrunk or grown to gigantic sizes often had only their underwear shrink or grow with them.
So, he took off his shirt, and then, grabbing the balloon, he took a deep breath and inflated said balloon. FFFFOOOOOOFFFFF. "Control the size of my shirt, please." he said. He let his grip on the balloon slip ever so slightly. A light hiss escaped.
immediately, his shirt shrunk a size smaller than normal.
It worked! Almost immediately, he grew his shirt back to normal size, and put it back on.
So he could shrink or grow people as well as their clothes, be it all the clothes they were wearing at the time or one item of clothing at a time.
He looked, and saw Leonard Gondman still watering his garden.