[ Yuri isn't concerned over the fact that Hayame is questioning pants. It's necessarily different from the apparel she wears, given the nature of her anatomy, so he doesn't think all too much of it. Doubtless, it's difficult to envision or anticipate how it would fit. ]

They should fit closely against the skin without constricting. This material, especially, is both durable and flexible.

[ The elasticity isn't something with which he'd been familiar upon arrival, but he'd quickly found it useful. He wouldn't wear it on a battlefield by any means, but that's what the overcoat and a good set of boots would be for. ]

Much easier to move about in than skirts, as well. No loose fabric to get tangled or twisted at an inopportune moment.