Joel tried some other things next. Though there was so much he wanted to try, he didn't know where to start. He could become whoever and whatever he wanted, so he started by adding muscle to his frame until he would easily be the new Mr. Olympia. Then he added some height and thickened his skin proportionate to his muscles so as to hide the veins and muscle fibre a little.
The mirror showed his criminally handsome head and massive, super sexy muscle god body. Unfortunately his clothes had tore from the increase in side and left him naked once again. He looked at his clothes in annoyance and was surprised when he saw them turn into the plasma-like substance his bodiless form was made of. The clothes on him flowed together as this substance and stretched larger until they fit his massive form perfectly.
On a hunch Joel waved his hand over the rest of his clothes in the drawers and imagined them getting larger. For a moment all he could see in the one open drawer was a glowing mass of plasma. Then it vanished to show his clothes, only several times larger now. "Well that's good to know," Joel murmured. A little extra practice showed he could actually change the shape of his clothing as well. He stripped to his boxers and changed them into briefs, then a speedo, boardshorts, cargo shorts, jeans, and back to boxers.
Next... well he wanted to see just how tall he could get. Already standing about 6'3'' he added some more height, opting for about as tall as the ceiling. That being the case he stopped growing at eight feet, his body having grown proportionately. So although his muscles hadn't actually grown, they were still massive now. He went down to the living room, which had a higher ceiling and continued his growth until he was 12 feet tall, and having to duck a little due to being taller than the ceiling. The feeling of growth was incredibly and he was ecstatic. He could keep on growing and find out just how giant he could get, or see what else he could do with his powers.