When River enters the bar, there's an old wool
blanket draped over her shoulders, though neither the bar nor
Serenity is cold enough to really warrant it. It's worn, a little faded, and has the sort of pattern one might find on the cheap blankets in Western American tourist-tack shops. That's probably exactly where it came from.
She heads for the staff hallway. When she returns, the blanket's gone. (Ennis will find it folded tidily on the floor outside his door. There are four green tea candies tucked inside.)
Next step: to acquire a mug of green tea, and settle down with it on the floor between two barstools, her back resting comfortably against the bar.