Costume
Each of the 'thugs' will be wearing hoodies similar to this one. Maybe darker. this is to give the impression that they are criminal like. And shifty characters. Both will be wearing the hood up.
The 'thugs' will both be wearing jeans similar to these (G-star) these style jeans are typical of youth and the fashion of today. The passer by that descovers the body will also be wearing jeans similar.
Both 'thugs' will be wearing trainers similar to these. they are also typical of youth and the fashion of today. They also compliment the outfit.
The victem will be wearing a blood stained shirt similar to this one to give the effect of being beat up/ murdered. gives the impression of a brutial attack.