[EXCLUSIVE VIDEO] Isabelle Lightwood's Halloween Costume Checklist Emeraude has dished out her top tips on how to dress up as Isabelle Lightwood for Halloween. All in black. Leather. Boots. Facebook Twitter Watch Again Watch Episode We hoped you enjoyed the awesome top tips from our very own Izzy on set! What else do you think completes Isabelle Lightwood's outfit? Let us know in the comments below!