If she only knew what a simple question can lead to so many answers. That bag evidently lead to more answers than she thought. Because he asked about the 'mystery bag,' he knows a great deal more about her life.
He raised his eyebrow when he noticed the uniform. A uniform of a team he heard about. He then looked into her eyes."So..." He picked up his tea-cup. "...you're an X-Men." He took a sip. "Similar to the Justice League."