Shmiras Shabbos Kehilchasa says that if wet clothes were left hanging up to dry before the start of shabbos, then they remain muktzeh for all of shabbos, even if they're totally dry the next morning.
He cites the Mishna on Brurah on this, then in the footnotes, notes R' that R' Shlomo Zalman Auerbach was rather puzzled by this Mishna Brurah. Wet clothes aren't actually muktzeh; if the only shirt you have is sopping wet, you are allowed to put it on and wear it, just try not to squeeze any water out of it. Ergo those clothes on the line were never "unusable."
Does anyone actually rule that such clothes are therefore not muktzeh? (Was R' Shlomo Zalman actually disagreeing and saying it would be allowed, or just giving a shrug and saying "but I can't argue with the mishna brurah...)