Although it's not immediately clear, there is actually an eminently sensible explanation for why Ilde is standing purposefully by the river's edge a bit further down in a wide-brimmed hat and her underwear. It doesn't matter right now, being largely irrelevant to what follows, but it's worth noting: an explanation exists, and there is a method to her madness.

It can wait, whatever it is; when she notices Wolfgang, she makes her way down the bank toward him without stopping to consider small and unimportant details like 'whether or not he actually wants company' and 'whether or not he actually wants her company, particularly'. Or 'would he prefer her company to be wearing pants', though in fairness this last oversight has more to do with the fact that it's astonishing to find her wearing as much as she currently is by the riverside, and onlookers should really just take what fabric they can get and be content with that.

She sits down beside him, instead of saying hello.