I bought a down jacket on Poshmark a while back. Was super excited to get it but the sizing was different (brand was purchased in Japan originally) so I can't wear it yet. Not that I want to at the moment, lol.
Yeah, Cath, anytime you buy on Posh or the other online clothing places, make SURE they give you exact measurements. I put them in all my photos shown with a measuring tape on every item to make sure. Like you said, there are different sizings when they are manufactured in different countries. That and things like pants have often been altered by prior owner or have shrunk in the wash.
I thought about you with one of my business purchases the other day. I thought, I bet Cath has one of these and takes it hiking with her. It was one of those Camelbak hydration systems. Cool item, but not quite sure how to list it yet.