We have one plate for everyone. We are down a couple bowls, though, so not enough for everyone to have soup at the same time.
It's not been a huge enough problem for me to go get some more, though...although, I do have that on my list of things to grab when I see the right ones for the right price.
We do have more glasses than we need, and that creates a problem for me. Well, the glasses are actually different sized mason jars. What I'd like to do is get a different shape/size jar for each person, that way we know who each cup belongs to. The other thing is, we usually leave the glasses out all day, some people forget which is theirs, so they get another. Then we have a dishwasher full of glasses, and no glasses left to drink from. I think having all different ones will help us cut down on that.