As the important people had to pass through town whenever they came out of the stronghold, Ren Xiaosu had seen them sitting in their cars in their suits from afar. Back then, Ren Xiaosu thought those important people had an imposing air about them.
But if someone wore a suit out into the wilderness, and a white suit at that, Ren Xiaosu would definitely cuss that person under his breath, "Dumbass!"
Wearing a suit would be too much of an impediment in a fight as it would restrict the wearer from raising their arms and legs. If someone encountered a wild animal they could not beat, they probably couldn't even run away.
But when Ren Xiaosu saw that young man standing atop the building, he did not find his clothing to be unsuitable or incongruous with the wilderness. That was because this person was not required to fight.