Especially since we're lending you these robes, please don't dirty them while wearing them. I believe the implication here is both literally getting them dirty, as well as metaphorically dirtying/dishonoring them by being a bad Buddhist.

I just don't think it's a good way to teach someone like that. I just don't think it suits her.

Ah well, if it's what Hijiri wants, it's fine, but still...