drape (something or oneself) over (someone or something)
1. To lay on a piece of furniture, usually with one's limbs splayed. In this usage, a reflexive pronoun is used between "drape" and "over." John came in and draped himself over the sofa while moaning about his ex-girlfriend. I was so exhausted from traveling that I draped myself over the bed as soon as I got to my hotel room.
2. To loosely place something over someone or something. In this usage, a noun or pronoun is used between "drape" and "over." It wasn't as cold out when I left the theater, so I just draped my coat over my shoulders.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
drape over (something)
[for cloth] to cover something and hang down. The robe draped over her knees, but she was still cold. The tablecloth draped over and reached down to the floor.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.