@SRH711 this is what i understand but it may be different
lol no she misunderstood him, I think. As he clearly said, "Who am I earning money for?" means he is it doing for her and all the dresses were meant for her but somehow it didn't reach her maybe due to incompetent maids who looked down upon her. While he thinks that she is deliberately wearing plain clothes because she looks down upon him or something.