I could find nothing on the internet, mostly just speculation. Did IRVC women really went bare-chested? Most historical Indian cultures covered their breasts, so I think it's a little strange. What about men? Did they really wear robes that hung from their left shoulder?
It's very hard to determine what kinds of clothes they wore as there's not many clothes preserved. However, it's possible when their writing system is decoded definitively that we will learn more about their culture and language. There's speculation that the Harappan civilization was Dravidian, but it's also possible they were neither Aryan or Dravidian. If they were either Aryan or Dravidian, then there is no real reason to suspect their clothing style would be different.
Any real study into it right now is speculation as the textiles are in tiny fragments.