Nice effort! I think the netting looks a bit polygonal - how many tris is the model - could you have added more detail? (like double? triple?)
Maybe having some netting end bits of string hanging off the sides so its not just self-contained to the top of the hat? The edges look a bit like when you cook a lasagna and it crisps up along the edge of the tray instead of going over the sides. Maybe a strap hanging off the edge?