Casual is the dress code that emphasizes comfort and personal expression over presentation,
formality and conformity. More simply, "casual" can be defined as something relaxed, occasional, not planned, or informal. It includes a very wide variety of costume, so it is perhaps better defined by what it is not than what it is.

Me :                                                  Dude :
Stone Island Sweatshirt                   Stone Island Sweatshirt
Nudie jeans                                      Cheap Monday Jeans
Gazelle Core adidas                         New Balance 574
Chemise Carhartt Polka Stripe         Vintage Ray Ban Aviator ad.