After all the physical changes and attempts to bargain his way out of going to school, Jon didn't have a lot of time to spend getting ready. He'd have to forego showering, and since none of his clothes fit the body his sister had given him, he'd have to grab some of her clothes.
Unfortunately, he was a still a couple of sizes larger than Zoe, especially in the chest and butt. After 10 minutes of fussing and wrigling, he managed to squeeze his lower half into Zoe's largest pair of jeans, but even those only came down slightly past mid-calf, and looked like very low-rise jeans on the upper half. On top of that, they were too tight in the waist, and despite his trim figure, dug into his hips a bit.
On the opposite end of the spectrum, there was no way that any of Zoe's B-cup bras were going to fit over Jessica's ample bustline, but Jon didn't have any problem skipping that step anyways (he'd regret that later, though). He put on a black Evanessence t-shirt Zoe had left sitting on her dresser. It didn't fit very well, and left his midriff exposed, but Jon figured he could deal with it for one day anyways.
His one "lucky break" was finding out that Zoe's shoes fit him near perfectly. Deciding on a pair of black platform shoes that had the smallest heels, Jon steadied himself and made his way downstairs.
What Jon should have done was given himself a final look in the mirror, or taken a good whiff of himself. Had he done either, he might have not made the mistake of going to school dressed like a slut, or smelling like the sex he'd ejoyed with Karyn the night before.
Karyn, on the other hand, certainly took notice when Jon came back downstairs.