Alec noticed the see-through clothing just fine, cheeks heating and eyes pointedly staying on Jace's face. But he'd been in Duplicity for a while, it took more than that to rattle him, even coming from his parabatai.

He pulled Jace in out of the rain and then shrugged out of his jacket. He hadn't been in the rain enough for it to dissolve. He draped it around Jace's shoulders. "It's okay. I've been here a while. Izzy's here too. Are you okay?" Alec asked worriedly.