This still seems like the holy grail for me, I know it can be done because e.g. Endura did it with their MTR bibs (sadly don’t work for me because of the floating pad) and obviously waterproof baggies exist, but my perfect combination would be a set of tights (preferably without a pad) with waterproof seat and maybe calves. It would be for wet and muddy gravel or CX type riding.
I’ve got an ancient set of Revolution tights with mostly windproof legs which are ideal for anything below 10C and wet or windy, but they’re very very very old and starting to get pretty threadbare… Everything I’ve seen these days just seems to be roubaix fabric with DWR which is just a massive con as far as I’m concerned.
Stolen Goat Orkaan perhaps?
Ta