"Round part?" 9S repeats slowly, confused. Thanks to having the lamppost as a stabliser, he awkwardly lifts his foot so he can tap the part in question. "I mean this spot."

As for why he's dressed like this...

He lowers his foot. "Uh, well... I received some new powers and it seems a clothing change was part of the deal?" He didn't ask for this! Just to be clear, "I don't normally dress like this, alright?"