Cast some clothes

"Don't worry, Warren, I said I would protect you and I will, okay?" Dione declared, channeling a burst of energy that instantly dried both herself and Juliet. Afterward, she clenched her fists and puffed out her chest in a heroic, warrior-like pose. "Besides, I'm not ashamed to walk back to the dorms like this anyway. I can always grab some spare clothes for you once we're inside."

"Wait, but if someone came all the way out here just to pull this prank and hide our clothes, what's stopping them from hanging around to watch me walk back like that?" you protested.

"Got a better idea, then?" she asked, raising an eyebrow.

"Well... actually, maybe I do..."

You closed your eyes, took a deep breath, and thrust your hands forward, channeling your mana as you muttered an incantation under your breath.

"Chamroups!"

In a shimmer of light, a full set of casual clothes materialized around your body, instantly concealing your nakedness.

"Well, well! Looks like the effects of that party potion finally wore off, huh? Conjured clothing? Not bad at all, Warren! Exactly what I'd expect from our top-ranking rookie."

In reality, however, you hadn't conjured real clothes at all. It was purely an illusion, nothing more than a trick of the light to hide your shame. If anyone were so bold as to reach out and grab your sleeve, they'd realize right away that there was literally nothing underneath. But for the moment, it did the trick.

"Um... what about me?" Juliet asked, looking down at her wet underclothes and flushing bright red. "I know I didn't lose my underwear, but I'm still basically naked out here..."

"Unfortunately, that's the only trick we've got, Juliet, but don't look at it like that! Think of it as a great way to boost your self-confidence!" you offered encouragingly.

"Or completely destroy what little self-esteem I have left..." the shy girl whispered under her breath, shivering.