When you've been trained as a gunslinger pretty much since you left the nursery, you learn very quickly to automatically notice things.

Like the fact that Wash's outfit has just changed utterly in the blink of an instant, as he stepped through the door. And that he's currently tugging at it as if it's fixed to his skin, rather than ordinary clothing.

Wash seems mildly disgruntled, but not actually worried. Still, it's rather inexplicable magic to Alain, and magical clothing that will not come off the skin is not a reassuring notion.

After a moment of consideration, he approaches the booth, mug in hand. "Hi, Wash."

Look, he's finally learning modern greetings.