I found a bunch of facebook groups for the local area that would often post "box of clothes, free" for various ages. But also hanging out in children's playpar

I found a bunch of facebook groups for the local area that would often post "box of clothes, free" for various ages. But also hanging out in children's playparks in the local neighbourhood would introduce children to each other, and other parents to us. That helped find a group of kids the same age, or slightly older, who we would sometimes offload clothes between. I guess it depends where you are, if those kind of things happen.