They might hang out in a hotel room

ROBES

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This clue plays on the double meaning of "hang out." While it could literally mean people lounging in a hotel room, it’s hinting at something you’d wear there—like a bathrobe. "Robes" are the cozy garments guests often slip into while relaxing in their rooms. The wordplay tricks you into thinking of socializing first, but the answer is the clothing itself.