The court is not going to do much here. He isn't paying you what he owes you, but he is paying *something*, so they are not likely to punish him if it looks like he is making an effort. Consider yourself lucky you get anything at all. I haven't seen child support in nearly a year.
Also, second-hand clothes are awesome. I hit consignment and thrift stores all the time. They are cheap, the clothes are soft from washing, and already shrunk.