[By having a sharp eye for observing others, that's how. A good part of it is also - again - of of mere curiosity and the desire to try out new things. Which doesn't count strictly for clothing.]
There really wouldn't.
[He then takes a small step back, giving Kija a good once over.]
It's settled, then.
[Such a pleasant looking grin. Totally not sly at all.]
It's time to begin building a new wardrobe for you, Kija-kun. ♥